C语言读取文件

// C语言读取文件
#include <stdio.h>

int main() {

   FILE *fp;
   char buff[255];

   fp = fopen(/tmp/test.txt, r);
   fscanf(fp, %s, buff);
   printf(1 : %s\n, buff );

   fgets(buff, 255, (FILE*)fp);
   printf(2: %s\n, buff );

   fgets(buff, 255, (FILE*)fp);
   printf(3: %s\n, buff );
   fclose(fp);

}