| 问题 | 答案 |
|---|---|
| 这个作业属于哪个课程 | https://edu.cnblogs.com/campus/zswxy/CST2019-4/homework/10269 |
| 这个作业要求在哪 | https://edu.cnblogs.com/campus/zswxy/CST2019-4/homework/10269 |
| 这个作业的目标 | 运用rand()函数 |
| 作业正文 | https://i.cnblogs.com/posts/edit;postId=12297716 |
| 其他参考文献 | 百度 csdn https://www.runoob.com/cprogramming/c-function-rand.html |
2.2.2设计思路和遇到的问题
设计思路：
在上次作业的基础上运用rand函数。
2.2.3 程序结果截图
2.2.4 程序代码
#include <stdio.h>
#include<stdlib.h>
#include<time.h>
void menu();
void help();
void error();
void operation_1();
void one_1();
void operation_2();
void two_1();
void operation_3();
void three_1();
int main()
{
int n;
printf("========== 口算生成器 ==========
");
printf("欢迎使用口算生成器 ：
");
printf("小学生必备神器
");
printf("
");
help();
while (1)
{
menu();
scanf_s("%d", &n);
switch (n)
{
case 1:operation_1(); break;
case 2:operation_2(); break;
case 3:operation_3(); break;
case 4:help(); break;
}
printf("
");
if (n == 5) break;
if (n > 5 || n < 1) error();
}
return 0;
}
void help()
{
printf("帮助信息
");
printf("您需要输入命令代号来进行操作
");
printf("一年级题目为不超过十位的加减法
");
printf("二年级题目为不超过百位的乘除法
");
printf("三年级题目为不超过百位的加减乘除混合题目
");
printf("
");
}
void menu()
{
printf("操作列表:
1)一年级 2)二年级 3)三年级
");
printf("4)帮助 5)退出程序
请输入代号:");
}
void error()
{
printf("哦买噶 错啦 请重新输入 ");
printf("
");
printf("
");
}
void operation_1()
{
printf("请输入题目数量>");
one_1();
}
void operation_2()
{
printf("请输入题目数量>");
two_1();
}
void operation_3()
{
printf("请输入题目数量>");
three_1();
}
void one_1()
{
int n, a, b, c;
scanf_s("%d", &n);
printf("一年级题目如下：
");
srand((unsigned)time(NULL));
for (int i = 1; i <= n; i++)
{
a = rand() % 10 + 1;
b = rand() % 10 + 1;
c = rand() % 2;
if (c == 0)
printf("%2d + %2d = ___", a, b);
else
printf("%2d - %2d = ___", a, b);
printf("
");
}
}
void two_1()
{
int n, a, b, c;
scanf_s("%d", &n);
printf("二年级题目如下：
");
srand((unsigned)time(NULL));
for (int i = 1; i <= n; i++)
{
a = rand() % 100;
b = rand() % 100;
c = rand() % 2;
if (c == 0)
printf("%3d * %3d = ___", a, b);
else
printf("%3d / %3d = ___", a, b);
printf("
");
}
}
void three_1()
{
int n, a, b, c;
scanf_s("%d", &n);
printf("三年级题目如下：
");
srand((unsigned)time(NULL));
for (int i = 1; i <= n; i++)
{
a = rand() % 100;
b = rand() % 100;
c = rand() % 4;
switch (c)
{
case 0:printf("%3d + %3d = ___", a, b); break;
case 1:printf("%3d - %3d = ___", a, b); break;
case 2:printf("%3d * %3d = ___", a, b); break;
case 3:printf("%3d / %3d = ___", a, b); break;
}
printf("
");
}
}
2.2.5Gitee上传截图与链接
