http://e-tutor.itsa.org.tw/e-Tutor/mod/programming/view.php?id=30754
#include<stdio.h> int main(){ int n; scanf("%d",&n); if(n>=3&&n<=5)printf("Spring\n"); else if(n>=6&&n<=8)printf("Summer\n"); else if(n>=9&&n<=11)printf("Autumn\n"); else printf("Winter\n"); }