为什么“输入操作员：”这个概念出现了两次？

Question

    int main() {
        // insert code here...
        char ch; //the operator
        int c, t, h ; //the weight of the three items
        int flag = 1; //note for iteration ending


        while (flag == 1) { 
            printf("input operator：");
            ch = getchar();
            switch (ch) {
                case 'a':
                    printf("input the weight of chaoxianji：");
                    scanf("%d", &c);
                    break;
                case 'b':
                    printf("input the weight of tiancai：");
                    scanf("%d", &t);
                    break;
                case 'c':
                    printf("input the weight of huluobo：");
                    scanf("%d", &h);
                    break;
                case 'q':
                    flag = 0; // get out of cycle 
                    break;
                }
            }
        return 0;

}

但输出块是： 我想知道为什么注释“输入操作符出现两次。 'break'应该把程序带到printf语句，不应该吗？