前面一部分的代码如下：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define PATHNAME "a.txt"


int main()
{    
         FILE *fp, *fpw;

    fp = fopen( PATHNAME , "r+" );

。。。。。。


出现的错误是： error C2275: 'FILE' : illegal use of this type as an expression
         f:\program files\microsoft visual studio\vc98\include\stdio.h(156) : see declaration of 'FILE'


我用的vc++ 6.0 ，当我把这个 源代码  以 .cpp 的格式存储，在打开调试，则一切正常
                当以  .c    格式存储，调试就会出现如上的错误


向大家请教！！

这部分代码不足以说明问题

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

全部代码
int main()
{
    char PATHNAME[20];

    char NAME[30] = "YOURNAME_";

    int V = 0;                 /*gate nums*/
    int E = 0;                /*wires nums*/
    int j = 0;               /*第一个while计数用*/
    int ft = 0;             /*标志是哪一个门在扇出*/
    int gate[5000];
    int iDontKnow[5000];
    char *gateType[5000][20];
    int D = 0;
/*    float weight[5000];*/
    char *weight_char[10];
    int fout = 0;
    
    int fo[5000] = {0};        /*f【0】表示 0号门有几个扇出*/
    int fi[5000] = {0};       /*记录了fin【4】【？】中？到底是几,同时刷新扇入数目*/

    int C = 0;
    int cc = 0;
    int pin_in[5000];
    int pin_out[5000];
    int zz = 0;
    int ww = 0;

/*---------以下用于输入输出文件名的拼接问题------*/    
    printf("enter file name :");
    scanf("%s",PATHNAME);

    strcat(NAME,PATHNAME );
    strcat(NAME, ".out");
    strcat(PATHNAME, ".in");
    
/*---------------以下读取 gate 的信息 ---------------------*/    

    

    FILE *fp, *fpw;

    fp = fopen( PATHNAME , "r+" );

    if( fp == NULL )
    {
        printf(" can not open file !!\n");
        return 0;
    }

    fscanf(fp,"%d\n",&V);

    
    
    

    while(j < V )
    {
        fscanf(fp,"%d %s %d\n", &gate[j], &gateType[j], &iDontKnow[j]);

        j = j+1;
    }


    fscanf(fp,"%d\n",&E);
    

    

/*----------------------------以下读取wires的信息-------------------------*/
    for(int l=0 ; l<E; l++)
    {
        
        fscanf(fp,"%d %s %d", &D, &weight_char, &ft);

                               /*weight[l] = atof();//现在weight_char已经成功将字符读取，关键在怎么将字符数组weight_char
                               转换成 字符常量  ，这样才能用  atof（）函数*/
        fo[ft] = D - 1;
        

        for(int l1=0 ; l1<D-1; l1++)
        {

            fscanf(fp," %d",&fout);

            for(int u=0; u<V; u++)
            {
                if(fout == u)
                {                
                       fi[u] = fi[u] + 1;
                    break;
                    
                }
                
                                
            }
        
        }


        fscanf(fp,"\n");
    }

/*--------------------以下求出 c  的值----------------------------*/    


    fclose(fp);


    for(int p=0; p<V; p++)
    {
        if((fi[p]+fo[p]) > C )
        {
            C = fi[p] + fo[p];
        }
    }


/*--------输出-------------------------------------------------*/


    fpw = fopen( NAME , "w" );

    if( fpw == NULL )
    {
        printf(" can not write file !!\n");
        return 0;
    }

/*------------------------ 以下  输出c an c lines-----*/
    fprintf(fpw,"%d\n",C);

    for(int q=1; q<=C; q++)
    {
        cc = 0;

        fprintf(fpw,"%d ",q);
        for(int y=0; y<V; y++)
        {
            if((fi[y]+fo[y]) == q)
            {
                cc = cc + 1;
            }
            
        }

        fprintf(fpw,"%d\n",cc);

    }
/*---------------以下 输出 fin------------*/
    for(int z=0; z<V; z++)
    {
        
        if(fi[z] == 0)
        {
           
            pin_in[zz] = z;
             zz = zz + 1;
        }

    }

    fprintf(fpw,"%d",zz);

    for(int m=0; m<zz; m++)
    {
        fprintf(fpw," %d",pin_in[m]);
    }

    fprintf(fpw,"\n");

/*----------------以下输出 fout-------*/

    for(int b=0; b<V; b++)
    {
        if(fo[b] == 0)
        {
            pin_out[ww] = b;
            ww = ww + 1;
        }
    }

    fprintf(fpw,"%d",ww);

    for(int n = 0; n<ww; n++)
    {
        fprintf(fpw," %d",pin_out[n]);
    }

    

    fclose(fpw);





    return 0;

}

谁来帮个忙啊！

DEV-C++ 通过编译器

//==============================================
// for(int i = 0; i < n; i++) 到C99标准才出现
// C++ 很早就支持这个了

C语言中变量声明必须在块的开头

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感觉有点做数据库查操作的味道...呵呵

为什么 以 .c  格式存储代码就会出错呢？
楼上元老指点一下啊

哦，原来如此，好的，知道了，谢谢各位了。

晕了都，呵呵