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Strings - Programming

Q1:

Which of the following statements are correct about the program below? 
#include<stdio.h>

int main()
{
    char str[20], *s;
    printf('Enter a string\n');
    scanf('%s', str);
    s=str;
    while(*s != '\0')
    {
        if(*s >= 97 && *s <= 122)
            *s = *s-32;
        s++;
    }
    printf('%s',str);
    return 0;
}

A The code converts a string in to an integer

B The code converts lower case character to upper case

C The code converts upper case character to lower case

D Error in code

ANS:A - The code converts a string in to an integer

This program converts the given string to upper case string. Output: Enter a string: AptitudeCrack AptitudeCrack