代码if((fp=fopen(filename,"r"))==NULL) { fprintf(stderr,"Error

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代码
if((fp=fopen(filename,"r"))==NULL)
{
fprintf(stderr,"Error opening file.");
exit(1);
}
是什么意思?

该段语句的意思是:打开文件名为filename的文件,根据fopen的返回值(fp),判断该文件是否打开,如果没有打开,则打印"Error opening file"信息,然后退出程序,如果正确打开,则跳过这里,执行后面的语句,

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