/in/foo.c: In function 'main':
/in/foo.c:16:13: warning: conversion lacks type at end of format [-Wformat=]
    printf("% %d",b,c);
             ^
/in/foo.c:16:11: warning: too many arguments for format [-Wformat-extra-args]
    printf("% %d",b,c);
           ^~~~~~