当输入2时，会输出： #include main() { int number; printf("input a number:"); scanf("%d",&number); switch( number ) { case 1: printf("January!\n"); case 2: printf("February!\n"); case 3: printf("March!\n"); case 4: printf("April!\n"); case 5: printf("May!\n"); case 6: printf("June!\n"); break; case 7: printf("July!\n"); break; case 8: printf("August!\n"); case 9: printf("September!\n"); case 10:printf("October!\n"); case 11:printf("November!\n"); break; case 12:printf("December!\n"); break; default:printf("input error!\n");break; } }