Program to toggle all characters in a string
Last Updated :
01 Mar, 2023
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.
Implementation:
C
// C program to toggle all characters
#include <stdio.h>
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$";
toggleChars(str);
printf("String after toggle \n");
printf("%s\n", str);
return 0;
}
// C++ program to toggle all characters
#include<bits/stdc++.h>
using namespace std;
void toggleChars(char str[])
{
for (int i=0; str[i]!='\0'; i++)
{
if (str[i]>='A' && str[i]<='Z')
str[i] = str[i] + 'a' - 'A';
else if (str[i]>='a' && str[i]<='z')
str[i] = str[i] + 'A' - 'a';
}
}
// Driver code
int main()
{
char str[] = "GeKf@rGeek$";
toggleChars(str);
cout << "String after toggle " << endl;
cout << str << endl;
return 0;
}
// Java 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$".toCharArray();
toggleChars(str);
System.out.println("String after toggle ");
System.out.println(String.valueOf(str));
}
}
// This code is contributed by 29AjayKumar
# Python3 program to toggle all characters
def toggleChars(str):
for i in range(len(str)):
if (str[i] >= 'A' and str[i] <= 'Z'):
str = str[:i] + chr(ord(str[i]) + \
ord('a') - ord('A')) + str[i + 1:];
else if (str[i] >= 'a' and str[i] <= 'z'):
str = str[:i] + chr(ord(str[i]) + \
ord('A') - ord('a')) + str[i + 1:];
return str;
# Driver code
str = "GeKf@rGeek$";
str = toggleChars(str);
print(str);
# This code is contributed by 29AjayKumar
// C# 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$".ToCharArray();
toggleChars(str);
Console.WriteLine("String after toggle ");
Console.WriteLine(String.Join("",str));
}
}
// This code is contributed by Princi Singh
<script>
function toggleChars(str)
{
for (let i = 0; i < str.length; i++)
{
if (str[i] >= 'A' && str[i] <= 'Z')
str[i] = String.fromCharCode(str[i].charCodeAt(0) + 'a'.charCodeAt(0) - 'A'.charCodeAt(0));
else if (str[i] >= 'a' && str[i] <= 'z')
str[i] = String.fromCharCode(str[i].charCodeAt(0) + 'A'.charCodeAt(0) - 'a'.charCodeAt(0));
}
}
let str = "GeKf@rGeek$".split("");
toggleChars(str);
document.write("String after toggle ");
document.write((str).join(""));
// This code is contributed by rag2127.
</script>
OutputString after toggle
gEkF@RgEEK$
Time complexity: O(n), where n is length of string
Auxiliary space: O(1)
We can use the Bitwise XOR operation to toggle all the characters in given string
As we know the ascii value of small and capital char case is differ by just 1 bit (5th bit). We can simply toggle that bit to toggle the char case of a string.
Implementation:
C
// C program to toggle all characters
#include <stdio.h>
void toggleChars(char str[])
{
for (int i = 0; str[i] != '\0'; i++) {
if (str[i] >= 65 && str[i] <= 90) {
str[i] = (char)(str[i] ^ (1 << 5));
}
}
}
// Driver code
int main()
{
char str[] = "GeKf@rGeek$";
printf("String before toggle\n");
printf("%s\n", str);
toggleChars(str);
printf("String after toggle\n");
printf("%s\n", str);
return 0;
}
// C++ program to toggle all characters
#include<bits/stdc++.h>
using namespace std;
void toggleChars(char str[])
{
for (int i=0; str[i]!='\0'; i++)
{
if (isalpha(str[i])) {
str[i] = (char)(str[i]^(1<<5));
}
}
}
// Driver code
int main()
{
char str[] = "GeKf@rGeek$";
cout << "String before toggle " << endl;
cout << str << endl;
toggleChars(str);
cout << "String after toggle " << endl;
cout << str << endl;
return 0;
}
// This code is contributed by @kaustubhvats08
// Java program to toggle all characters
class GFG
{
static void toggleChars(char str[])
{
for (int i=0; i<str.length; i++)
{
if (Character.isAlphabetic(str[i])) {
str[i] = (char)(str[i]^(1<<5));
}
}
}
// Driver code
public static void main(String[] args)
{
char str[] = "GeKf@rGeek$".toCharArray();
System.out.println("String before toggle ");
System.out.println(String.valueOf(str));
toggleChars(str);
System.out.println("String after toggle ");
System.out.println(String.valueOf(str));
}
}
// This code is contributed by @kaustubhvats08
# Python3 program to toggle all characters
def toggleChars(s):
for i in range(len(s)):
if s[i].isalpha():
s = s[:i] + str(chr(ord(s[i])^(1<<5))) + s[i+1:]
return s;
# Driver code
s = "GeKf@rGeek$";
print("String before toggle")
print(s)
s = toggleChars(s);
print("String after toggle")
print(s);
# This code is contributed by @kaustubhvats08
// C# program to toggle all characters
using System;
class GFG
{
static void toggleChars(char []str)
{
for (int i = 0; i < str.Length; i++)
{
if (Char.IsLetter(str[i])){
str[i] = (char)(str[i]^(1<<5));
}
}
}
// Driver code
public static void Main(String[] args)
{
char []str = "GeKf@rGeek$".ToCharArray();
Console.WriteLine("String before toggle ");
Console.WriteLine(String.Join("",str));
toggleChars(str);
Console.WriteLine("String after toggle ");
Console.WriteLine(String.Join("",str));
}
}
// This code is contributed by @kaustubhvats08
<script>
function toggleChars(str)
{
for (let i = 0; i < str.length; i++)
{
if ((/[a-zA-Z]/).test(str[i])){
str[i] = (String.fromCharCode((str[i].charCodeAt(0)^(1<<5))));
}
}
}
let str = "GeKf@rGeek$".split("");
document.write("String before toggle ");
document.write((str).join(""));
toggleChars(str);
document.write("String after toggle ");
document.write((str).join(""));
// This code is contributed by @kaustubhvats08.
</script>
OutputString before toggle
GeKf@rGeek$
String after toggle
gEkF@RgEEK$
Time complexity: O(n), where n is the length of the string
Auxiliary space: O(1)
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