C语言寒假大作战04

问题	答案
这个作业属于哪个课程	https://edu.cnblogs.com/campus/zswxy/CST2019-2
这个作业要求在哪里	C语言寒假大作战04
这个作业的目标	gitee 与 git基础命令学习与使用,能够结合新知识编写菜单程序
作业正文	https://www.cnblogs.com/shenxinglou/p/12323106.html
其他参考文献	%g与%d

一、菜单程序函数调用图

二、设计思路和遇到的问题

• 设计思路:这次设计需要给原先的三种口算题加上结果，所以使用switch语句，分别列出产生的随机数使用不同算术运算符时的情况就可以了。
• 遇到的问题：在处理一年级和二年级题目时，还比较简单，但三年级题目有四种不同算术运算符的组合，有点复杂，查了一些资料，想了一些办法后选择了自己最容易理解的方法来解决问题。

三、 程序结果截图

四、程序代码

#include<stdio.h>
#include <stdlib.h>
#include <time.h>
void menu() {
    printf("
操作列表：
");
    printf("1)一年级    2)二年级    3)三年级 
4)帮助     5)退出程序
");
    printf("请输入操作>");
}
void help() {
    printf("帮助信息:
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；
二年级题目为不超过百位的乘除法；
三年级题目为不超过百位的加减乘除混合题目.

");
}
void error() {
    printf("Error!!!
错误操作指令，请重新输入

");
}
void Operation1() {
    int i,j;
    printf("现在是一年级题目:
");
    printf("请输入生成个数>");
    scanf("%d",&j);
    printf("<执行操作:

");
    for(i=1; i<=j; i++) {
        int num1 = rand() % 11;
        int num2 = rand() % 11;
        int a = rand() % 2+1;
        switch (a) {
        case 1:
            printf(" %d + %d = %2d 
",num1,num2,num1+num2);
            break;
        case 2:
            printf(" %d - %d = %2d 
",num1,num2,num1-num2);
            break;
        }
    }
}
void Operation2() {
    int i,j;
    printf("现在是二年级题目:
");
    printf("请输入生成个数>");
    scanf("%d",&j);
    printf("<执行操作:

");
    for(i=1; i<=j; i++) {
        int num1 = rand() % 101;
        int num2 = rand() % 101;
        int num3 = rand() % 100+1;
        int a = rand() % 2 + 1;
        switch (a) {
        case 1:
            printf(" %d * %d = %2d 
",num1,num2,num1*num2);
            break;
        case 2:
            printf(" %d / %d = %g 
",num1,num3,1.0*num1/num3);
            break;
        }
    }
}
void Operation3() {
    int i,j;
    printf("现在是三年级题目:
");
    printf("请输入生成个数>");
    scanf("%d",&j);
    printf("<执行操作:

");
    for(i=1; i<=j; i++) {
        int num1 = rand() % 101;
        int num2 = rand() % 101;
        int num3 = rand() % 101;
        int num4 = rand() % 100+1;
        int num5 = rand() % 100+1;
        int a = rand() % 16+1;
        switch(a) {
        case 1:
            printf(" %2d + %2d + %2d = %d
 ",num1,num2,num3,num1+num2+num3);
            break;
        case 2:
            printf(" %2d - %2d - %2d = %d
 ",num1,num2,num3,num1-num2-num3);
            break;
        case 3:
            printf(" %2d * %2d * %2d = %d
 ",num1,num2,num3,num1*num2*num3);
            break;
        case 4:
            printf(" %2d / %2d / %2d = %g
 ",num1,num4,num5,1.0*num1/num4/num5);
            break;
        case 5:
            break;
            printf(" %2d + %2d - %2d = %d
 ",num1,num2,num3,num1+num2-num3);
            break;
        case 6:
            printf(" %2d - %2d + %2d = %d
 ",num1,num2,num3,num1-num2+num3);
            break;
        case 7:
            break;
            printf(" %2d * %2d / %2d = %g
 ",num1,num2,num4,num1*num2/1.0*num4);
            break;
        case 8:
            printf(" %2d / %2d * %2d = %g
 ",num1,num4,num3,num1/1.0*num4*num3);
            break;
        case 9:
            break;
            printf(" %2d + %2d * %2d = %d
 ",num1,num2,num3,num1+num2*num3);
            break;
        case 10:
            break;
            printf(" %2d * %2d + %2d = %d
 ",num1,num2,num3,num1*num2+num3);
            break;
        case 11:
            break;
            printf(" %2d + %2d / %2d = %g
 ",num1,num2,num4,num1+1.0*num2/num4);
            break;
        case 12:
            break;
            printf(" %2d / %2d + %2d = %g
 ",num1,num4,num3,1.0*num1/num4+num3);
            break;
        case 13:
            break;
            printf(" %2d - %2d * %2d = %d
 ",num1,num2,num3,num1-num2*num3);
            break;
        case 14:
            break;
            printf(" %2d * %2d - %2d = %d
 ",num1,num2,num3,num1*num2-num3);
            break;
        case 15:
            printf(" %2d - %2d / %2d = %g
 ",num1,num2,num4,num1-1.0*num2/num4);
            break;
        case 16:
            printf(" %2d / %2d - %2d = %g
 ",num1,num4,num3,1.0*num1/num4-num3);
            break;
        }
    }
}
int main() {
    srand((int)time(0));
    int Grade;
    printf("========口算生成器========
欢迎使用口算生成器：

");
    help();
    menu();
    while(Grade!=5) {
        scanf("%d",&Grade);
        printf("<执行操作:

");
        switch(Grade) {
        case 1:
            Operation1();
            break;
        case 2:
            Operation2();
            break;
        case 3:
            Operation3();
            break;
        case 4:
            help();
            break;
        case 5:
            printf("程序结束，欢迎下次使用
任意键结束......
");
            break;
        default:
            error();
            break;
        }
        if(Grade!=5) menu();
    }
}

五、Gitee上传截图与链接

七、主页链接

https://gitee.com/shenxinglou