相关疑难解决方法(0)

我正在尝试一个小例子来了解静态外部变量及其用途.静态变量属于局部范围,外部变量属于全局范围.

static5.c

#include<stdio.h>
#include "static5.h"
static int m = 25;
int main(){
 func(10);
 return 0;
}

static5.h

#include<stdio.h>
int func(val){
 extern int m;
 m = m + val;
 printf("\n value is : %d \n",m);
}

gcc static5.c static5.h

o/p:

static5.c:3: error: static declaration of m follows non-static declaration
static5.h:3: note: previous declaration of m was here

EDITED

正确的程序:

a.c:
#include<stdio.h>
#include "a1_1.h"
int main(){
 func(20);
 return 0;
}

a1.h:
static int i = 20;

a1_1.h:
#include "a1.h"
int func(val){
 extern …