Program to toggle all characters in a string

Difficulty Level : Easy
Last Updated : 01 Sep, 2021

Given a string, the task is to toggle all the characters of the string i.e to convert Upper case to Lower case and vice versa.

Examples:

Input  : gfg
Output : GFG

Input  : aBc12#
Output : AbC12#

Input  : tu@kmiNi
Output : TU@KMInI

Traverse the given string, if uppercase characters come, convert into lowercase and lowercase letter convert into uppercase.

C++

// C++ program to toggle all characters
#include<bits/stdc++.h>
using namespace std;
 
void toggleChars(char str[])
{
    for (int i=0; str[i]!='\0'; i++)
    {
        if (str[i]>='A' && str[i]<='Z')
            str[i] = str[i] + 'a' - 'A';
        else if (str[i]>='a' && str[i]<='z')
            str[i] = str[i] + 'A' - 'a';
    }
}
 
// Driver code
int main()
{
    char str[] = "GeKf@rGeek$";
    toggleChars(str);
    cout << "String after toggle " << endl;
    cout << str << endl;
    return 0;
}

Java

// Java program to toggle all characters
 
class GFG
{
 
static void toggleChars(char str[])
{
    for (int i=0; i<str.length; i++)
    {
        if (str[i]>='A' && str[i]<='Z')
            str[i] = (char) (str[i] + 'a' - 'A');
        else if (str[i]>='a' && str[i]<='z')
            str[i] = (char) (str[i] + 'A' - 'a');
    }
}
 
// Driver code
public static void main(String[] args)
{
    char str[] = "GeKf@rGeek$".toCharArray();
    toggleChars(str);
    System.out.println("String after toggle ");
    System.out.println(String.valueOf(str));
}
}
 
// This code is contributed by 29AjayKumar

Python3

# Python3 program to toggle all characters
def toggleChars(str):
 
    for i in range(len(str)):
        if (str[i] >= 'A' and str[i] <= 'Z'):
            str = str[:i] + chr(ord(str[i]) + \
                     ord('a') - ord('A')) + str[i + 1:];
        elif (str[i] >= 'a' and str[i] <= 'z'):
            str = str[:i] + chr(ord(str[i]) + \
                     ord('A') - ord('a')) + str[i + 1:];
    return str;
 
# Driver code
str = "GeKf@rGeek$";
str = toggleChars(str);
print(str);
     
# This code is contributed by 29AjayKumar

C#

// C# program to toggle all characters
using System;
     
class GFG
{
 
static void toggleChars(char []str)
{
    for (int i = 0; i < str.Length; i++)
    {
        if (str[i] >= 'A' && str[i] <= 'Z')
            str[i] = (char) (str[i] + 'a' - 'A');
        else if (str[i] >= 'a' && str[i] <= 'z')
            str[i] = (char) (str[i] + 'A' - 'a');
    }
}
 
// Driver code
public static void Main(String[] args)
{
    char []str = "GeKf@rGeek$".ToCharArray();
    toggleChars(str);
    Console.WriteLine("String after toggle ");
    Console.WriteLine(String.Join("",str));
}
}
 
// This code is contributed by Princi Singh

Javascript

<script>
 
function toggleChars(str)
{
    for (let i = 0; i < str.length; i++)
    {
        if (str[i] >= 'A' && str[i] <= 'Z')
            str[i] =  String.fromCharCode(str[i].charCodeAt(0) + 'a'.charCodeAt(0) - 'A'.charCodeAt(0));
        else if (str[i] >= 'a' && str[i] <= 'z')
            str[i] =  String.fromCharCode(str[i].charCodeAt(0) + 'A'.charCodeAt(0) - 'a'.charCodeAt(0));
    }
}
 
let str = "GeKf@rGeek$".split("");
toggleChars(str);
document.write("String after toggle ");
document.write((str).join(""));
 
// This code is contributed by rag2127.
</script>

Output:

gEkF@RgEEK$

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Program to toggle all characters in a string

C++

Java

Python3

C#

Javascript

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