Dadas dos strings str1 y str2. La tarea es verificar si las dos strings dadas son iguales si se sigue una comparación que no distingue entre mayúsculas y minúsculas, es decir, las mayúsculas y minúsculas de las strings se ignoran en Java.
Ejemplos:
Input: str1 = "Geeks", str2 = "geeks" Output: Same Input: str1 = "Geek", str2 = "geeksforgeeks" Output: Not Same
Método 1: enfoque ingenuo
- Compare cada carácter de la primera string con el carácter correspondiente de la segunda string.
- si coincide, compare el siguiente carácter.
- Si no coincide, verifique si coincide ignorando sus casos.
- Si coincide, compare el siguiente carácter.
- Si todos los caracteres coinciden, devuelve verdadero
- Si algún carácter no coincide, devuelve falso.
La implementación se da a continuación.
C++
#include <iostream>
using namespace std;
// Function to compare two strings
// ignoring their cases
bool equalIgnoreCase(string str1, string str2)
{
int i = 0;
// length of first string
int len1 = str1.size();
// length of second string
int len2 = str2.size();
// if length is not same
// simply return false since both string
// can not be same if length is not equal
if (len1 != len2)
return false;
// loop to match one by one
// all characters of both string
while (i < len1) {
// if current characters of both string are same,
// increase value of i to compare next character
if (str1[i] == str2[i]) {
i++;
}
// if any character of first string
// is some special character
// or numeric character and
// not same as corresponding character
// of second string then return false
else if (!((str1[i] >= 'a' && str1[i] <= 'z')
|| (str1[i] >= 'A' && str1[i] <= 'Z'))) {
return false;
}
// do the same for second string
else if (!((str2[i] >= 'a' && str2[i] <= 'z')
|| (str2[i] >= 'A' && str2[i] <= 'Z'))) {
return false;
}
// this block of code will be executed
// if characters of both strings
// are of different cases
else {
// compare characters by ASCII value
if (str1[i] >= 'a' && str1[i] <= 'z') {
if (str1[i] - 32 != str2[i])
return false;
}
else if (str1[i] >= 'A' && str1[i] <= 'Z') {
if (str1[i] + 32 != str2[i])
return false;
}
// if characters matched,
// increase the value of i to compare next char
i++;
} // end of outer else block
} // end of while loop
// if all characters of the first string
// are matched with corresponding
// characters of the second string,
// then return true
return true;
} // end of equalIgnoreCase function
// Function to print the same or not same
// if strings are equal or not equal
void equalIgnoreCaseUtil(string str1, string str2)
{
bool res = equalIgnoreCase(str1, str2);
if (res == true)
cout << "Same" << endl;
else
cout << "Not Same" << endl;
}
// Driver Code
int main()
{
string str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
return 0;
}
Java
class GFG
{
// Function to compare two strings
// ignoring their cases
static boolean equalIgnoreCase(String str1, String str2)
{
int i = 0;
// length of first string
int len1 = str1.length();
// length of second string
int len2 = str2.length();
// if length is not same
// simply return false since both string
// can not be same if length is not equal
if (len1 != len2)
return false;
// loop to match one by one
// all characters of both string
while (i < len1)
{
// if current characters of both string are same,
// increase value of i to compare next character
if (str1.charAt(i) == str2.charAt(i))
{
i++;
}
// if any character of first string
// is some special character
// or numeric character and
// not same as corresponding character
// of second string then return false
else if (!((str1.charAt(i) >= 'a' && str1.charAt(i) <= 'z')
|| (str1.charAt(i) >= 'A' && str1.charAt(i) <= 'Z')))
{
return false;
}
// do the same for second string
else if (!((str2.charAt(i) >= 'a' && str2.charAt(i) <= 'z')
|| (str2.charAt(i) >= 'A' && str2.charAt(i) <= 'Z')))
{
return false;
}
// this block of code will be executed
// if characters of both strings
// are of different cases
else
{
// compare characters by ASCII value
if (str1.charAt(i) >= 'a' && str1.charAt(i) <= 'z')
{
if (str1.charAt(i) - 32 != str2.charAt(i))
return false;
}
else if (str1.charAt(i) >= 'A' && str1.charAt(i) <= 'Z')
{
if (str1.charAt(i) + 32 != str2.charAt(i))
return false;
}
// if characters matched,
// increase the value of i to compare next char
i++;
} // end of outer else block
} // end of while loop
// if all characters of the first string
// are matched with corresponding
// characters of the second string,
// then return true
return true;
} // end of equalIgnoreCase function
// Function to print the same or not same
// if strings are equal or not equal
static void equalIgnoreCaseUtil(String str1, String str2)
{
boolean res = equalIgnoreCase(str1, str2);
if (res == true)
System.out.println( "Same" );
else
System.out.println( "Not Same" );
}
// Driver Code
public static void main(String args[])
{
String str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
}
}
// This code is contributed by Arnab Kundu
Python3
# Function to compare two strings
# ignoring their cases
def equalIgnoreCase(str1, str2):
i = 0
# length of first string
len1 = len(str1)
# length of second string
len2 = len(str2)
# if length is not same
# simply return false since both string
# can not be same if length is not equal
if (len1 != len2):
return False
# loop to match one by one
# all characters of both string
while (i < len1):
# if current characters of both string are same,
# increase value of i to compare next character
if (str1[i] == str2[i]):
i += 1
# if any character of first string
# is some special character
# or numeric character and
# not same as corresponding character
# of second string then return false
elif (((str1[i] >= 'a' and str1[i] <= 'z') or
(str1[i] >= 'A' and str1[i] <= 'Z')) == False):
return False
# do the same for second string
elif (((str2[i] >= 'a' and str2[i] <= 'z') or
(str2[i] >= 'A' and str2[i] <= 'Z')) == False):
return False
# this block of code will be executed
# if characters of both strings
# are of different cases
else:
# compare characters by ASCII value
if (str1[i] >= 'a' and str1[i] <= 'z'):
if (ord(str1[i]) - 32 != ord(str2[i])):
return False
elif (str1[i] >= 'A' and str1[i] <= 'Z'):
if (ord(str1[i]) + 32 != ord(str2[i])):
return False
# if characters matched,
# increase the value of i
# to compare next char
i += 1
# end of outer else block
# end of while loop
# if all characters of the first string
# are matched with corresponding
# characters of the second string,
# then return true
return True
# end of equalIgnoreCase function
# Function to print the same or not same
# if strings are equal or not equal
def equalIgnoreCaseUtil(str1, str2):
res = equalIgnoreCase(str1, str2)
if (res == True):
print("Same")
else:
print("Not Same")
# Driver Code
if __name__ == '__main__':
str1 = "Geeks"
str2 = "geeks"
equalIgnoreCaseUtil(str1, str2)
str1 = "Geek"
str2 = "geeksforgeeks"
equalIgnoreCaseUtil(str1, str2)
# This code is contributed by
# Surendra_Gangwar
C#
using System;
class GFG
{
// Function to compare two strings
// ignoring their cases
static bool equalIgnoreCase(string str1, string str2)
{
int i = 0;
// length of first string
int len1 = str1.Length;
// length of second string
int len2 = str2.Length;
// if length is not same
// simply return false since both string
// can not be same if length is not equal
if (len1 != len2)
return false;
// loop to match one by one
// all characters of both string
while (i < len1)
{
// if current characters of both string are same,
// increase value of i to compare next character
if (str1[i] == str2[i])
{
i++;
}
// if any character of first string
// is some special character
// or numeric character and
// not same as corresponding character
// of second string then return false
else if (!((str1[i] >= 'a' && str1[i] <= 'z')
|| (str1[i] >= 'A' && str1[i] <= 'Z')))
{
return false;
}
// do the same for second string
else if (!((str2[i] >= 'a' && str2[i] <= 'z')
|| (str2[i] >= 'A' && str2[i] <= 'Z')))
{
return false;
}
// this block of code will be executed
// if characters of both strings
// are of different cases
else
{
// compare characters by ASCII value
if (str1[i] >= 'a' && str1[i] <= 'z')
{
if (str1[i] - 32 != str2[i])
return false;
}
else if (str1[i] >= 'A' && str1[i] <= 'Z')
{
if (str1[i] + 32 != str2[i])
return false;
}
// if characters matched,
// increase the value of i to compare next char
i++;
} // end of outer else block
} // end of while loop
// if all characters of the first string
// are matched with corresponding
// characters of the second string,
// then return true
return true;
} // end of equalIgnoreCase function
// Function to print the same or not same
// if strings are equal or not equal
static void equalIgnoreCaseUtil(string str1, string str2)
{
bool res = equalIgnoreCase(str1, str2);
if (res == true)
Console.WriteLine( "Same" );
else
Console.WriteLine( "Not Same" );
}
// Driver Code
public static void Main()
{
string str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
}
}
// This code is contributed by ihritik
Javascript
<script>
// Function to compare two strings
// ignoring their cases
function equalIgnoreCase(str1, str2)
{
let i = 0;
// length of first string
let len1 = str1.length;
// length of second string
let len2 = str2.length;
// if length is not same
// simply return false since both string
// can not be same if length is not equal
if (len1 != len2)
return false;
// loop to match one by one
// all characters of both string
while (i < len1)
{
// if current characters of both string are same,
// increase value of i to compare next character
if (str1[i] == str2[i])
{
i++;
}
// if any character of first string
// is some special character
// or numeric character and
// not same as corresponding character
// of second string then return false
else if (!((str1[i].charCodeAt() >= 'a'.charCodeAt() && str1[i].charCodeAt() <= 'z'.charCodeAt())
|| (str1[i].charCodeAt() >= 'A'.charCodeAt() && str1[i].charCodeAt() <= 'Z'.charCodeAt())))
{
return false;
}
// do the same for second string
else if (!((str2[i].charCodeAt() >= 'a'.charCodeAt() && str2[i].charCodeAt() <= 'z'.charCodeAt())
|| (str2[i].charCodeAt() >= 'A'.charCodeAt() && str2[i].charCodeAt() <= 'Z'.charCodeAt())))
{
return false;
}
// this block of code will be executed
// if characters of both strings
// are of different cases
else
{
// compare characters by ASCII value
if (str1[i].charCodeAt() >= 'a'.charCodeAt() && str1[i].charCodeAt() <= 'z'.charCodeAt())
{
if (str1[i].charCodeAt() - 32 != str2[i].charCodeAt())
return false;
}
else if (str1[i].charCodeAt() >= 'A'.charCodeAt() && str1[i].charCodeAt() <= 'Z'.charCodeAt())
{
if (str1[i].charCodeAt() + 32 != str2[i].charCodeAt())
return false;
}
// if characters matched,
// increase the value of i to compare next char
i++;
} // end of outer else block
} // end of while loop
// if all characters of the first string
// are matched with corresponding
// characters of the second string,
// then return true
return true;
} // end of equalIgnoreCase function
// Function to print the same or not same
// if strings are equal or not equal
function equalIgnoreCaseUtil(str1, str2)
{
let res = equalIgnoreCase(str1, str2);
if (res == true)
document.write( "Same" + "</br>");
else
document.write( "Not Same" + "</br>");
}
let str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
// This code is contributed by diveshrabadiya07.
</script>
Producción:
Same Not Same
Método 2: Usar la función toUpperCase()
- Cambie todos los caracteres en minúsculas de ambas strings a mayúsculas y compárelos.
- Si son iguales, escriba «igual»; de lo contrario, escriba «No es igual».
La implementación se da a continuación.
C++
#include<bits/stdc++.h>
using namespace std;
// Function to compare two strings ignoring their cases
bool equalIgnoreCase(string str1, string str2)
{
int i = 0;
// Convert to uppercase
// using transform() function and ::toupper in STL
transform(str1.begin(), str1.end(), str1.begin(), ::toupper);
transform(str2.begin(), str2.end(), str2.begin(), ::toupper);
// Comparing both using inbuilt function
int x = str1.compare(str2);
// if strings are equal,
// return true otherwise false
if (x != 0)
return false;
else
return true;
}
// Function to print the same or not same
// if strings are equal or not equal
void equalIgnoreCaseUtil(string str1, string str2)
{
bool res = equalIgnoreCase(str1, str2);
if (res == true)
cout << "Same" << endl;
else
cout << "Not Same" << endl;
}
// Driver Code
int main()
{
string str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
return 0;
}
Java
class GFG
{
// Function to compare two Strings ignoring their cases
static boolean equalIgnoreCase(String str1, String str2)
{
int i = 0;
// Convert to lowercase
// using toUpperCase function
str1 = str1.toUpperCase();
str2 = str2.toUpperCase();
// Comparing both using inbuilt function
int x = str1.compareTo(str2);
// if Strings are equal,
// return true otherwise false
if (x != 0)
{
return false;
}
else
{
return true;
}
}
// Function to print the same or not same
// if Strings are equal or not equal
static void equalIgnoreCaseUtil(String str1, String str2)
{
boolean res = equalIgnoreCase(str1, str2);
if (res == true)
{
System.out.println("Same");
}
else
{
System.out.println("Not Same");
}
}
// Driver Code
public static void main(String[] args)
{
String str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
}
}
// This code has been contributed by 29AjayKumar
Python3
# Python 3 Code for above approach
# Function to compare two strings
# ignoring their cases
def equalIgnoreCase(str1, str2) :
# Convert to uppercase
str1 = str1.upper();
str2 = str2.upper();
# if strings are equal,
# return true otherwise false
x = str1 == str2;
return x;
# Function to print the same or not same
# if strings are equal or not equal
def equalIgnoreCaseUtil(str1, str2) :
res = equalIgnoreCase(str1, str2);
if (res == True) :
print("Same");
else :
print("Not Same");
# Driver Code
if __name__ == "__main__" :
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
# This code is contributed by Ryuga
C#
using System;
public class GFG
{
// Function to compare two Strings ignoring their cases
static bool equalIgnoreCase(String str1, String str2)
{
// Convert to lowercase
// using toUpperCase function
str1 = str1.ToUpper();
str2 = str2.ToUpper();
// Comparing both using inbuilt function
int x = str1.CompareTo(str2);
// if Strings are equal,
// return true otherwise false
if (x != 0)
{
return false;
}
else
{
return true;
}
}
// Function to print the same or not same
// if Strings are equal or not equal
static void equalIgnoreCaseUtil(String str1, String str2)
{
bool res = equalIgnoreCase(str1, str2);
if (res == true)
{
Console.WriteLine("Same");
}
else
{
Console.WriteLine("Not Same");
}
}
// Driver Code
public static void Main()
{
String str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
}
}
/* This code contributed by PrinciRaj1992 */
Javascript
<script>
// Function to compare two Strings ignoring their cases
function equalIgnoreCase(str1,str2)
{
let i = 0;
// Convert to lowercase
// using toUpperCase function
str1 = str1.toUpperCase();
str2 = str2.toUpperCase();
// Comparing both using inbuilt function
let x = str1 == (str2);
// if Strings are equal,
// return true otherwise false
if (!x)
{
return false;
}
else
{
return true;
}
}
// Function to print the same or not same
// if Strings are equal or not equal
function equalIgnoreCaseUtil(str1,str2)
{
let res = equalIgnoreCase(str1, str2);
if (res == true)
{
document.write("Same<br>");
}
else
{
document.write("Not Same<br>");
}
}
// Driver Code
let str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
// This code is contributed by avanitrachhadiya2155
</script>
Producción:
Same Not Same
Método 3: Usar la función toLowerCase()
- Cambie todos los caracteres de ambas strings a minúsculas y compárelos.
- Si son iguales, escriba «igual»; de lo contrario, escriba «No es igual».
La implementación se da a continuación.
C++
#include<bits/stdc++.h>
using namespace std;
// Function to compare two strings ignoring their cases
bool equalIgnoreCase(string str1, string str2)
{
int i = 0;
// Convert to lowercase
// using transform() function and ::tolower in STL
transform(str1.begin(), str1.end(), str1.begin(), ::tolower);
transform(str2.begin(), str2.end(), str2.begin(), ::tolower);
// Comparing both using inbuilt function
int x = str1.compare(str2);
// if strings are equal,
// return true otherwise false
if (x != 0)
return false;
else
return true;
}
// Function to print the same or not same
// if strings are equal or not equal
void equalIgnoreCaseUtil(string str1, string str2)
{
bool res = equalIgnoreCase(str1, str2);
if (res == true)
cout << "Same" << endl;
else
cout << "Not Same" << endl;
}
// Driver Code
int main()
{
string str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
return 0;
}
Java
// A Java Program to find the longest common prefix
class GFG
{
// Function to compare two strings ignoring their cases
static boolean equalIgnoreCase(String str1, String str2)
{
int i = 0;
// Convert to lowercase
// using toLowerCase function
str1 = str1.toLowerCase();
str2 = str2.toLowerCase();
// Comparing both using inbuilt function
int x = str1.compareTo(str2);
// if strings are equal,
// return true otherwise false
return x == 0;
}
// Function to print the same or not same
// if strings are equal or not equal
static void equalIgnoreCaseUtil(String str1, String str2)
{
boolean res = equalIgnoreCase(str1, str2);
if (res == true)
System.out.println("Same");
else
System.out.println("Not Same");
}
// Driver Code
public static void main(String[] args)
{
String str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
}
}
// This code contributed by Rajput-Ji
Python3
# Python 3 Code for above approach
# Function to compare two strings
# ignoring their cases
def equalIgnoreCase(str1, str2) :
# Convert to lower case
str1 = str1.lower();
str2 = str2.lower();
# if strings are equal,
# return true otherwise false
x = str1 == str2;
return x;
# Function to print the same or not same
# if strings are equal or not equal
def equalIgnoreCaseUtil(str1, str2) :
res = equalIgnoreCase(str1, str2);
if (res == True) :
print("Same");
else :
print("Not Same");
# Driver Code
if __name__ == "__main__" :
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
# This code is contributed by ihritik
C#
using System;
class GFG
{
// Function to compare two Strings ignoring their cases
static bool equalIgnoreCase(String str1, String str2)
{
// Convert to lowercase
// using toUpperCase function
str1 = str1.ToUpper();
str2 = str2.ToUpper();
// Comparing both using inbuilt function
int x = str1.CompareTo(str2);
// if Strings are equal,
// return true otherwise false
if (x != 0)
{
return false;
}
else
{
return true;
}
}
// Function to print the same or not same
// if Strings are equal or not equal
static void equalIgnoreCaseUtil(String str1, String str2)
{
bool res = equalIgnoreCase(str1, str2);
if (res == true)
{
Console.WriteLine("Same");
}
else
{
Console.WriteLine("Not Same");
}
}
// Driver Code
public static void Main()
{
String str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
}
}
/* This code contributed by PrinciRaj1992 */
Javascript
<script>
// A Javascript Program to find the longest common prefix
// Function to compare two strings ignoring their cases
function equalIgnoreCase(str1,str2)
{
let i = 0;
// Convert to lowercase
// using toLowerCase function
str1 = str1.toLowerCase();
str2 = str2.toLowerCase();
// Comparing both using inbuilt function
let x = (str1 == (str2));
// if strings are equal,
// return true otherwise false
return x == true;
}
// Function to print the same or not same
// if strings are equal or not equal
function equalIgnoreCaseUtil(str1,str2)
{
let res = equalIgnoreCase(str1, str2);
if (res == true)
document.write("Same<br>");
else
document.write("Not Same<br>");
}
// Driver Code
let str1, str2;
str1 = "Geeks";
str2 = "geeks";
equalIgnoreCaseUtil(str1, str2);
str1 = "Geek";
str2 = "geeksforgeeks";
equalIgnoreCaseUtil(str1, str2);
// This code is contributed by rag2127
</script>
Producción:
Same Not Same
Publicación traducida automáticamente
Artículo escrito por Vivek.Pandit y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA