11-7全局变量作用域测试

#include<stdio.h>
int a,b;
int f1()
{
	int a=10;
	printf("i am in f1 a=%d b=%d\n",a,b);
}
float c,d;
int f2()
{
	float c=100.0;
	printf("i am in f2 a=%d c=%f d=%f\n",a,b,c,d);
}
int main()
{
	a=1;
	b=2;
	c=50.0;
	d=60.0;
	printf("i am in main1  a=%d c=%f d=%f\n",a,b,c,d);
	f1();f2();
	printf("i am in main2  a=%d c=%f d=%f\n",a,b,c,d);
	return 0;
	getchar();
}