S1E31：局部变量和全局变量
#include <stdio.h>//鱼C论坛—BaysideLizard写于2023年11月14日
//int a,b=500;
//全局变量默认初始化为0。
void fun();
int main()
{
int i = 500;
printf("before,i = %d\n",i);
for(int i = 0;i < 10;i++)
{
//for中定义的i仅适用于for循环体内部。
printf("i = %d\n",i);
}
printf("after,i = %d\n",i);
//全局变量实验
extern int a,b;
//extern关键字：用来说明此变量在后边定义了。
printf("In fun,before,a = %d,b = %d\n",a,b);
fun();
printf("In fun,after,a = %d,b = %d\n",a,b);
return 0;
}
void fun()
{
int b;
extern int a;
a = 123;//没有局部变量a，则修改全局变量a的值
b = 789;//有局部变量b，则修改局部变量b的值
printf("In fun,a = %d,b = %d\n",a,b);
}
int a,b=500;
运行结果：
before,i = 500
i = 0
i = 1
i = 2
i = 3
i = 4
i = 5
i = 6
i = 7
i = 8
i = 9
after,i = 500
In fun,before,a = 0,b = 500
In fun,a = 123,b = 789
In fun,after,a = 123,b = 500
Process returned 0 (0x0) execution time : 0.059 s
Press any key to continue.
在FishC学C的第十五天 很自律哦，未来的大佬(*I`*)
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