Toggle case of all characters of string

Posted on Apr 20, 2020

C program to toggle case of all characters of string. i.e. to convert upper case characters to lower case characters and lower case characters to upper case characters in a string.

Program

#include<stdio.h>
#include<conio.h>
#define MAX 50

void main()
{
	char str[MAX];
    int i;

    printf("Enter the string\t:");
    gets(str);

    i = 0;
    while(str[i] != '\0')
    {
        if(str[i]>=65 && str[i]<=92)
            str[i] = str[i] + 32;
        else if(str[i]>=97 && str[i]<=122)
            str[i] = str[i] - 32;
        i++;
    }

    printf("\nString in toggled case is\t:%s",str);

    getch();
}

Output

Enter the string        :Welcome to CourseCRUX.com

String in toggled case is       :wELCOME TO cOURSEcrux.COM