c - 在C编程中创建一个文件，并在文件中写入hello world

#include<stdio.h>
int main()
{
    FILE *opening;
    opening = fopen("hello.usr","w");
    fprintf(opening,"Hello world!");
    fclose(opening);
    printf("Writing to the file was successful.\n");
    printf("Closing the program");
    return 0;
}

我试过用c语言编写一个文件，并写下“HelloWorld！”在里面这个密码怎么了？

最佳答案

如果您想知道是什么问题，请检查fopen的结果

opening = fopen("hello.usr","w");
if (opening == NULL) {
    perror("fopen");
}