pointers-and-functions.c

#include <stdio.h>

int squaringNumber(int num) {
    int square = num * num;
    return square;
}

void squareNumber(int *numberReference) {
    int num = *numberReference;
    int square = num * num;
    *numberReference = square;
}


int main(int argc, const char * argv[]) {
    
    int number = 10;
    
    printf("number %i\n", number);
    
    int squaredNumber = squaringNumber(number);
    
    printf("number %i, squared number %i\n", number, squaredNumber);
    
    squareNumber(&number);
    
    printf("number %i\n", number);
    
    return 0;
}