#include<stdio.h>
extern int a,b;
extern int c;
extern float f;
int main()
{
int a,b;
int c;
float f;
a=10;
b=20;
c=a+b;
printf("value of c:%d \n");
f=70.0/3.0;
printf("value of f:%f \n");
return 0;
}
value of c:-2065103096
value of f:0.000000
原文：https://www.cnblogs.com/catmiyc/p/9366085.html