/* Test of the five() function */
#include <stdio.h>
#include <math.h>   /* because we call sqrt() later */

int five (void) {
    return 5;
}

main () {
    int i;

    /* Assign a function result to a variable */
    i = five();
    /* check */
    printf("i should be five: %d\n", i);

    /* Include a function result in an expression */
    printf("25 is %d\n", 4 * five() + 10 - five() );

    /* compare a function result */
    if (five() == 5) {
        printf("five() is returning 5 correctly.\n");
    }

    /* function in a function call in a function call... */
    printf("Square root of 5 is %f\n", sqrt(five()));

    /* Throw away a function result */
    five();
    printf("Where did it go??\n");
}