Main.c: In function 'main': Main.c:9:29: error: expected ')' before 'or' if(n%4==0&&n%100!=0 or n%400==0&&n%100==0) printf("Yes\n"); ^ Main.c:5:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ Main.c:8:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^