Example of global scope but bad usage

global_scope.c

#include <stdio.h>
int foo(int, int, int, int, int, int);

// Globally scoped
int a, b, c = 0;
int x = 10;
int d, e = 0;
        
int main(int argc, char * argv[])
{
        foo(a, b, c, x, d, e);
}

int foo(int aa, int bb, int cc, int xx, int dd, int ee)
{
        // Parameters are scoped to 'foo'
        printf("Number: %d %d %d\n", aa, bb, cc);
        scanf("%d %d %d", &aa, &bb, &cc);
        dd = xx + aa + bb + cc;
        ee = dd/4;
        printf("Your number is: %d\n ", ee);
        return 0;
}