帮忙看看为什么这段C代码运行报错？

[李赞红]

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

void main()
{
FILE *fp;
double d = 23.31;
int i = 13;
long li = 1234567L;

if((fp = fopen("jak","wb+")) = NULL)
{
printf("文件打开失败");
exit(1);
}

fwrite(&d,sizeof(double),1,fp);
fwrite(&i,sizeof(int),1,fp);
fwrite(&li,sizeof(long),1,fp);

fclose(fp);

if((fp = fopen("jak","rb+")) = NULL)
{
printf("文件打开失败");
exit(1);
}

fread(&d,sizeof(double),1,fp);
fread(&i,sizeof(int),1,fp);
fread(&li,sizeof(long),1,fp);

printf("%f,%d,%ld",d,i,li);
fclose(fp);
}

[dot99]

（fp = fopen("jak","wb+")) = NULL
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[dot99]

你两处都是这个错误～～

[Devillove]

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

void main()
{
FILE *fp;
double d = 23.31;
int i = 13;
long li = 1234567L;

if((fp = fopen("jak","wb+")) == NULL)
{
printf("文件打开失败");
exit(1);
}

fwrite(&d,sizeof(double),1,fp);
fwrite(&i,sizeof(int),1,fp);
fwrite(&li,sizeof(long),1,fp);

fclose(fp);

if((fp = fopen("jak","rb+")) == NULL)
{
printf("文件打开失败");
exit(1);
}

fread(&d,sizeof(double),1,fp);
fread(&i,sizeof(int),1,fp);
fread(&li,sizeof(long),1,fp);

printf("%f,%d,%ld",d,i,li);
fclose(fp);
}

[李赞红]

晕，原来是这里，谢谢啊。