/in/foo.c: In function 'main':
/in/foo.c:7:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%d",&n1);
  ^~~~~
/in/foo.c:7:2: warning: incompatible implicit declaration of built-in function 'scanf'
/in/foo.c:7:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
/in/foo.c:18:3: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
   printf("%d ",c[i]);
   ^~~~~~
/in/foo.c:18:3: warning: incompatible implicit declaration of built-in function 'printf'
/in/foo.c:18:3: note: include '<stdio.h>' or provide a declaration of 'printf'
/in/foo.c:19:2: warning: incompatible implicit declaration of built-in function 'printf'
  printf("\n");
  ^~~~~~
/in/foo.c:19:2: note: include '<stdio.h>' or provide a declaration of 'printf'
/in/foo.c:21:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=0;i<nd;i++)
  ^~~
/in/foo.c:23:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return 0;
   ^~~~~~