没有语法错误可以运行   文件地址也打开了

if(f=fopen("D:\\information management.txt","a")==NULL)
               {    printf("file open error!\n");
                    exit(0);
               }
    fprintf(f,"%s ","student id:    name:    age:     birthday:     address:      telephone:");
    fprintf(f,"%s %s %d %s %s %s",num,name,&age,birthday,address,telephone);
               
    fclose(f);

if((f=fopen("D:\\information management.txt","a"))==NULL)

谢谢   已经修改好了