例5-7

#include<stdio.h>
int x;
int f();
int main(void)
{
    int a=1;

    x=a;
    a=f();
    {
        int b=2;
        b=a+b;
        x=x+b;
    }
    printf("%d%d",a,x);


    return 0;
}

int f()
{
    int x=4;

    return x;
}