/in/foo.c: In function 'main':
/in/foo.c:6:8: warning: unknown escape sequence: '\040'
  scanf("%d\ %d",&year,&month);
        ^~~~~~~~
/in/foo.c:24:21: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  } else if(year%4==0&&year%100!=0||year%400==0){
            ~~~~~~~~~^~~~~~~~~~~~~