例5-7
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; }
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; }