/in/foo.c: In function 'main':
/in/foo.c:7:10: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
  scanf("%d,%d\n",n1,n2);
          ^
/in/foo.c:7:13: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'int' [-Wformat=]
  scanf("%d,%d\n",n1,n2);
             ^
/in/foo.c:7:2: warning: 'n1' is used uninitialized in this function [-Wuninitialized]
  scanf("%d,%d\n",n1,n2);
  ^~~~~~~~~~~~~~~~~~~~~~
/in/foo.c:7:2: warning: 'n2' is used uninitialized in this function [-Wuninitialized]