// PROGRAM no_pass

#include "TrueBASIC.h"
int main();
void add_one();

int main()
{
    int x;

    x = 10;                             // local variable name x defined in main program
    add_one();
    printf("%d\n", x);

    return 0;
}

void add_one()
{
    int x;

    // variable name x not passed
    ++x;                                // local variable name defined in subroutine
}