// Demonstrating how to play with characters in C
// Program converts a lower case letter to upper case
// Sasha Vassar Week 2, Lecture 3


#include <stdio.h>

// Converting a lower case letter to upper case
// Problem: A user inputs a lower case letter, and wants 
// the computer to output the same letter, but in upper case.
// Possibilities/Breakpoints?
// Eg. input is 'c' (99), and we want to output 'C' (67)
// 'c' - 'a' = 99 - 97 = 2
// 'c' - 'a' + 'A' = 99 - 97 + 65 = 67

int main (void) {

// 1. Read input from the user
    char lower_case;
    char upper_case;
    int scanf_return;
    
    printf("Please enter a lower case letter: ");
    scanf_return = scanf(" %c", &lower_case);
    
    printf("scanf_return %d\n", scanf_return);
    if (scanf_return == 1) {
        if (lower_case >= 'a' && lower_case <= 'z') {
            upper_case = lower_case - 'a' + 'A';
            printf("The capital letter is %c\n", upper_case);
        } else {
            printf("You did not enter a lower case letter.");
            return 1;
        }
    
    }
    
// 2. Convert that input from lower case to upper case
// 3. Print out the upper case letter


    return 0;
}