Main.c: In function 'main': Main.c:6:16: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if (a%4==0 && a%100 != 0 || a%400==0){ ^ Main.c: At top level: Main.c:13:5: error: expected identifier or '(' before 'return' return 0; ^ Main.c:14:1: error: expected identifier or '(' before '}' token } ^ Main.c: In function 'main': Main.c:5:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a); ^