foo.c: In function 'main':
foo.c:13:14: error: expected ';' before 'printf'
   13 |  y3 = x1 % x2
      |              ^
      |              ;
   14 | 
   15 |  printf("y1=%d\n",y1);
      |  ~~~~~~       
foo.c:7:6: warning: variable 'y1' set but not used [-Wunused-but-set-variable]
    7 |  int y1 = 0;
      |      ^~

[Hydro](https://hydro.ac)提供评测服务