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);

}