foo.c: In function 'main':
foo.c:6:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'scanf'
    6 |         scanf ("%d,%d",&a,&b);
      |         ^~~~~
foo.c:7:21: error: expected ';' before 'if'
    7 |         printf("x=")
      |                     ^
      |                     ;
    8 |         if(x==-)
      |         ~~           
foo.c:14:9: error: expected declaration or statement at end of input
   14 |         printf(c)
      |         ^~~~~~
foo.c:5:17: warning: unused variable 'c' [-Wunused-variable]
    5 |         int a,b,c,x
      |                 ^
foo.c:5:15: warning: unused variable 'b' [-Wunused-variable]
    5 |         int a,b,c,x
      |               ^
foo.c:5:13: warning: unused variable 'a' [-Wunused-variable]
    5 |         int a,b,c,x
      |             ^

[Hydro](https://hydro.ac)提供评测服务