C String Lowercase

Example: How tolower() function works?

#include <stdio.h>
#include <ctype.h>
int main()
{
    char c, result;

    c = 'M';
    result = tolower(c);
    printf("tolower(%c) = %c\n", c, result);

    c = 'm';
    result = tolower(c);
    printf("tolower(%c) = %c\n", c, result);

    c = '+';
    result = tolower(c);
    printf("tolower(%c) = %c\n", c, result);

    return 0;
}

Output

tolower(M) = m
tolower(m) = m
tolower(+) = +