C pointer sample

pointer.c

#include <stdio.h>

void foo1(int * bar) {
    // bar is now set to 2 outside this function
    // scanf works in a similar way
    // * dereferences bar, without it we would try to assign 2 to a pointer
    *bar = 2;
}

void foo2(int bar) {
    // won't affect bar outside of this function
    bar = 5;
}

int main(int argc, const char * argv[]) {
    int bar = 3;

    // this function needs a pointer, so we use & to get the pointer to bar
    foo1(&bar); 

    // won't do anything to bar in this scope
    foo2(bar);

    printf("%d", bar); // will print 2
    getchar();

    return 0;
}