How can I export the output result in C language to a txt document?

In the C language, file operation functions can be used to export the output results as a txt document.

Here is an example code:

#include <stdio.h>

int main() {
    FILE *fp; // 文件指针
    char data[] = "Hello, world!"; // 要输出的内容

    // 打开文件，如果文件不存在则创建新文件
    fp = fopen("output.txt", "w");
    
    // 判断文件是否成功打开
    if (fp == NULL) {
        printf("文件打开失败！\n");
        return 1;
    }
    
    // 向文件写入内容
    fprintf(fp, "%s", data);
    
    // 关闭文件
    fclose(fp);
    
    printf("输出内容成功导出到output.txt文件中！\n");
    
    return 0;
}

In the code above, the fopen() function is first used to open a file named output.txt with the mode parameter “w” indicating that the file will be opened for writing. If the file does not exist, a new file will be created.

Next, use the fprintf() function to write the content to the file.

Finally, close the file using the fclose() function.

After running the code above, a file named output.txt will be created in the current directory, with “Hello, world!” written in it. Once completed, a message “Output successfully exported to the file output.txt!” will be printed on the terminal.