/in/foo.c: In function 'main':
/in/foo.c:5:10: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'double *' [-Wformat=]
  scanf("%d %d",&a,&b);
          ^
/in/foo.c:5:13: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'double *' [-Wformat=]
  scanf("%d %d",&a,&b);
             ^
/in/foo.c:7:11: warning: format '%d' expects argument of type 'int', but argument 2 has type 'double' [-Wformat=]
  printf("%d\n",sum);
           ^