p021function

#include <stdio.h>

/* demonstrating how a function is declared, called, and defined */

/* In the book I don't go into the fact that you can't have a function inside a function

 But you can't, and since the call to square is inside main,

 the definition of square must be outside main

 */

/* So in this example we have the declaration of square;

 then the main function which calls square;

 then the definition of main

 */

// declaration so subsequent code can call the function

int square(int i); 

int main (int argc, const char * argv[])

{    

    

    // calling the function

    int i = 3;

    printf("\nI'm going to call square with an argument of %i\n", i);

    

    i = square(i);

    printf("I did call square and the result was %i\n\n", i);

    

    

    return 0;

}

// definition for the function

int square(int i) {

    return i * i;

};

I'm going to call square with an argument of 3

I did call square and the result was 9