C Program to Replace Lowercase Characters by Uppercase & Vice-Versa

#include < stdio.h>
#include < ctype.h>
 
void main()
{
    char sentence[100];
    int count, ch, i;
 
    printf("Enter a sentence \n" );
    for (i = 0; (sentence[i] = getchar()) != '\n'; i++)
    {
        ;
    }
    sentence[i] = '\0';
    /*  shows the number of chars accepted in a sentence */
    count = i;
    printf("The given sentence is   : %s" , sentence);
    printf("\n Case changed sentence is: " );
    for (i = 0; i < count; i++)
    {
        ch = islower(sentence[i])? toupper(sentence[i]) :
tolower(sentence[i]);
        putchar(ch);
    }
}

Output

 Enter a sentence
wELCOME tO sANFOUNDRY
The given sentence is   : wELCOME tO sANFOUNDRY
Case changed sentence is: Welcome To Sanfoundry

For More Details Please Visit Ictjobs.info