C语言写入文本文件示例：将字符串写入test1.txt

#include <stdio.h> #include <stdlib.h>

int main(){ FILE *fp1;

fp1 = fopen('test1.txt', 'w');

if (fp1 == NULL){
    printf('Can't open file!

'); exit(1); }

fprintf(fp1, 'Hello, world!');

fclose(fp1);

return 0;

}