Example: C Program to Reverse the Case of Input Character using C Type library

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// C Program to Reverse the Case of Input Character using C Type library
#include <stdio.h>
#include <ctype.h>
// ctype.h header file loaded to call the string functions

int main() {
    char random_char;

    printf("Enter an alphabet character to convert: ");
    scanf("%c", &random_char);

    printf("\nThe Reverse case of the '%c' is: '", random_char);

    if (islower(random_char))
        putchar(toupper(random_char));
    else
        putchar(tolower(random_char));
    printf("'\n");
    return 0;
}