convert_to_all_capital_letters.c

#include <stdio.h>
#include <cs50.h>
#include <string.h>


int main(void)
{
    // take the user's name and capitalize all letters
    string name = get_string("enter your name: ");
    printf("All Uppercase: ");
    // output each character of the user's name
    for (int i = 0; i < strlen(name); i++)
    {
        int is_lower_case = (name[i] >= 'a') && (name[i] <= 'z');
        
        if (is_lower_case)
        {
            int magic_number = 'a' - 'A'; // always 32 no matter what letter we use
            printf("%c", name[i] - magic_number);
        }
        else
        {
            printf("%c", name[i]);
        }
    }
    printf("\n");
}