if((fp=fopen("date.txt","w"))==NULL) { printf("File open err

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if((fp=fopen("date.txt","w"))==NULL) { printf("File open error!\n"); exit(0);能不能解释下什么意思,

if((fp=fopen("date.txt","w"))==NULL) //如果不能打开文件date.txt,则
{
printf("File open error!\n");// 显示“File open error!(文件打开错误)”
exit(0);//并退出程序
}

if((fp=fopen("date.txt","w"))==NULL) { printf("File open err if ((fp=fopen("date.txt","r"))==NULL)是什么意思? if(fp = fopen("bank_txt","w") == NULL) { printf("can not ope if ((fp==fopen(filename,"w"))==NULL) 改为 if ((fp=fopen(filena fp=fopen("e:\\subjectsdel.txt","w"))==NULL是什么意思 if((fp=fopen("text.txt","ab+"))==NULL)其中ab+啥意思 if ((fp=fopen("student.bin","wb"))==NULL) fp=fopen("SAVE.txt","rb"))==NULL if((fp=fopen("d=\\jrzh\\example\\stu-list","wb+"))==NULL)中的N 代码if((fp=fopen(filename,"r"))==NULL) { fprintf(stderr,"Error fp=fopen(p, fp=fopen("DATA_KEHU",