实验2
task1.c源代码点击查看代码#include<stdlib.h>
#include<time.h>
#define N 5
#define N1 80
#define N2 35
int main(){
int cnt;
int random_majior, random_no;
srand(time(NULL));
cnt = 0;
while (cnt < N) {
random_majior = rand() % 2;
if (random_majior) {
random_no = rand() % N1 + 1;
printf("20256343%04d\n", random_no);
}
else {
random_no = rand() % N2 + 1;
printf("20256136%04d\n", random_no);
}
cnt++;
}
return 0;
}运行结果截图
去掉前:
两次随机生成的数字不同
去掉后:
两次随机生成的数虽然随机但相同
回答问题
srand(time(NULL))的作用:设置随机数种子,使生成的数字完全随机
程序的作用:随机生成两个专业的学号中的5个学号
task2.c源代码
点击查看代码#include <stdio.h>
int main() {
int choice, quantity;
float total_price = 0, amount_paid, change;
while (1) {
printf("\n自动饮料售卖机菜单:\n");
printf("1. 可乐 - 3 元/瓶\n");
printf("2. 雪碧 - 3 元/瓶\n");
printf("3. 橙汁 - 5 元/瓶\n");
printf("4. 矿泉水 - 2 元/瓶\n");
printf("0. 退出购买流程\n");
printf("请输入饮料编号: ");
scanf("%d", &choice);
if (choice == 0)
break;
if (choice < 1 || choice > 4) {
printf("无效的饮料编号,请重新输入。\n");
continue;
}
printf("请输入购买的数量: ");
scanf("%d", &quantity);
if (quantity < 0) {
printf("购买数量不能为负数,请重新输入。\n");
continue;
}
if(choice == 1 || choice == 2)
total_price += 3 * quantity;
else if(choice == 3)
total_price += 5 * quantity;
else
total_price += 2 * quantity;
printf("请投入金额: ");
scanf("%f", &amount_paid);
change = amount_paid - total_price;
printf("本次购买总价: %.2f 元\n", total_price);
printf("找零: %.2f 元\n", change);
total_price = 0;
}
printf("感谢您的购买,欢迎下次光临!\n");
return 0;
}运行结果截图
回答问题
若去掉line 47,会引发程序异常导致中止
continue的作用:继续循环中的下一步
task3.c源代码
点击查看代码#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main() {
char color;
while (1) {
scanf("%c", &color);
getchar();
if (color == 'y')
{
printf("wait a minute\n");
}
else if (color == 'r')
{
printf("stop!\n");
}
else if (color == 'g')
{
printf("go go go\n");
}
else
{
printf("something must be wrong...\n");
}
}
return 0;
}运行结果截图
task4.c源代码
点击查看代码#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main() {
double sum = 0, max_num = 0, min_num = 20000, num;
printf("输入今日开销,直到输入-1时终止:\n");
while (1) {
scanf("%lf", &num);
if (num > max_num) {
max_num = num;
}
if (num > 0 && num < min_num) {
min_num = num;
}
sum += num;
if (num == -1)
break;
}
printf("今日累计消费总额:%.1lf\n", sum);
printf("今日最高一笔开销:%.1lf\n", max_num);
printf("今日最低一笔开销:%.1lf\n", min_num);
return 0;
}运行结果截图
task5.c源代码
点击查看代码#includeint main() { int a, b, c; while (1) { scanf("%d %d %d", &a, &b, &c); if(a + b yyds。多谢分享 收藏一下 不知道什么时候能用到 喜欢鼓捣这些软件,现在用得少,谢谢分享! 前排留名,哈哈哈 感谢分享,学习下。
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