/*
 * Program to count upper case characters in string.
 * No user-provided input for now, only hard-coded test input.
 */
#include <stdio.h>
#include <ctype.h> /* has isupper() */

/* count upper-case characters in string s */
/* notice that we could declare the parameter as "char * s" instead */
int count_upper_case(char s[]) {
    int i;
    int count = 0;
    for (i = 0; s[i] != '\0';  ++i) {
        if (isupper(s[i])) ++count;
    }
    return count;
}

/* test count_upper_case function (print s, count_upper_case(s)) */
void test_count_upper_case(char s[]) {
    printf("%d uppercase characters in %s\n", count_upper_case(s), s);
}

/* main program */
int main(void) {

    /* 
     * not specifying sizes of these arrays means the compiler
     * will make them just big enough
     */
    char s1[] = "hello world";
    char s2[] = "HELLO world";

    /* first test with some strings stored in variables */
    test_count_upper_case(s1);
    test_count_upper_case(s2);
    /* also test with strings passed as literals */
    test_count_upper_case("Hello World");
    test_count_upper_case("1234567890");

    return 0;
}