| 问题 | 答案 |
|---|---|
| 这个作业属于哪个课程 | https://edu.cnblogs.com/campus/zswxy/CST2019-4/homework/10277 |
| 这个作业要求在哪 | https://edu.cnblogs.com/campus/zswxy/CST2019-4/homework/10277 |
| 这个作业的目标 | 运用rand()函数 |
| 作业正文 | https://www.cnblogs.com/xdf-123/p/12318622.html |
| 其他参考文献 | 百度 csdn |
2.2.2 设计思路和遇到的问题
设计思路：
rand函数的运用在上次的基础上。
问题：
随机数的构建，rand函数的运用。
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>
#include <string.h>
void menu();
void help();
void one(); void operation_1();
void two(); void operation_2();
void three(); void operation_3();
void error();
int main()
{
int opt = 1, n;
printf("==========口算生成器==========
");
printf("欢迎使用口算生成器:
");
printf("
");
help();
while (opt != 0)
{
menu();
printf("请输入操作> ");
scanf("%d", &opt);
printf("<执行操作:)
");
printf("
");
switch (opt)
{
case 1:operation_1(); break;
case 2:operation_2(); break;
case 3:operation_3(); break;
case 4:help(); break;
case 5:printf("程序结束, 欢迎下次使用
");
printf("任意键结束……");
opt = 0;
default:error(); break;
}
}
return 0;
}
void menu()
{
printf("
");
printf("操作列表:
");
printf("1)一年级 2)二年级 3)三年级
");
printf("4)帮助 5)退出程序
");
}
void help()
{
printf("
");
printf("帮助信息
");
printf("您需要输入命令代号来进行操作,且
");
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.
");
}
void operation_1()
{
printf("请输入生成个数>");
one();
}
void operation_2()
{
printf("请输入生成个数>");
two();
}
void operation_3()
{
printf("请输入生成个数>");
three();
}
void one()
{
int n, a, b, c, d;
time_t t;
srand((unsigned)time(&t));
printf("现在是一年级题目:
");
scanf("%d", &n);
printf("<执行操作:)
");
for (int i = 0; i < n; i++)
{
a = rand() % 10;
b = rand() % 10;
c = rand() % 2;
if (c == 0)
{
d = a + b;
printf("%d + %d = %d
", a, b, d);
}
else
{
d = a - b;
printf("%d - %d = %d
", a, b, d);
}
}
}
void two()
{
int n, a, b, c;
float d;
time_t t;
srand((unsigned)time(&t));
printf("现在是二年级题目:
");
scanf("%d", &n);
printf("<执行操作:)
");
for (int i = 0; i < n; i++)
{
a = rand() % 10;
b = rand() % 10;
c = rand() % 2;
if (c == 0)
{
d = a * b;
printf("%d * %d = %g
", a, b, d);
}
else {
while (b == 0)
{
b = rand() % 10;
}
d = a / (b * 1.0);
printf("%d / %d = %g
", a, b, d);
}
}
}
void three()
{
int n, m, i, a, b, c;
float z;
char fh1[2], fh2[2];
time_t t;
srand((unsigned)time(&t));
printf("现在是三年级题目:
");
scanf("%d", &n);
printf("<执行操作:)
");
char fh[4][6] = { "*","/","+","-" };
for (int i = 0; i < n; i++)
{
a = rand() % 100;
b = rand() % 100;
c = rand() % 100;
while (a == 0 || b == 0 || c == 0)
{
a = rand() % 100; b = rand() % 100; c = rand() % 100;
}
strcpy(fh1, fh[rand() % 3]);
strcpy(fh2, fh[rand() % 3]);
if (strcmp(fh1, "*") == 0 && strcmp(fh2, "*") == 0)
{
z = a * b * c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "*") == 0 && strcmp(fh2, "/") == 0)
{
z = a * b / (c * 1.0);
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "*") == 0 && strcmp(fh2, "+") == 0)
{
z = a * b + c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "*") == 0 && strcmp(fh2, "-") == 0)
{
z = a * b - c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "/") == 0 && strcmp(fh2, "+") == 0)
{
z = a / (b * 1.0) + c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "/") == 0 && strcmp(fh2, "-") == 0)
{
z = a / (b * 1.0) - c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "/") == 0 && strcmp(fh2, "/") == 0)
{
z = a / (b * 1.0) / (c * 1.0);
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "+") == 0 && strcmp(fh2, "-") == 0)
{
z = a + b - c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "+") == 0 && strcmp(fh2, "+") == 0)
{
z = a + b + c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "-") == 0 && strcmp(fh2, "-") == 0)
{
z = a - b - c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "/") == 0 && strcmp(fh2, "*") == 0)
{
z = a / (b * 1.0) * c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "+") == 0 && strcmp(fh2, "/") == 0)
{
z = a + b / (c * 1.0);
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "+") == 0 && strcmp(fh2, "*") == 0)
{
z = a + b * c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "-") == 0 && strcmp(fh2, "/") == 0)
{
z = a - b / (c * 1.0);
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "-") == 0 && strcmp(fh2, "+") == 0)
{
z = a - b + c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
else if (strcmp(fh1, "-") == 0 && strcmp(fh2, "*") == 0)
{
z = a - b * c;
printf("%2d %s %2d %s %2d = %g
", a, fh1, b, fh2, c, z);
}
}
}
void error()
{
printf("Error!!!
");
printf("错误操作指令, 请重新输入
");
}
2.2.5 Gitee上传截图与链接
