问题	答案
这个作业属于那个课程	https://edu.cnblogs.c0m/campus/zswxy/CST2019-4
这个作业的要求在哪里	https://edu.cnblogs.com/campus/zswxy/CST2019-4/homework/10277
作业正文	在上次各年级题目中加上答案
参考文献	百度

2.2.2 设计思路和遇到的问题

设计思路：在上次的作业上加上答案。

问题：这次比较简单，还没有问题。

2.2.3 程序结果截图

2.2.4 程序代码截图

#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==========\n");

printf("欢迎使用口算生成器:\n");

printf("\n");

help();

while(opt!=0)

{

menu();

printf("请输入操作> ");

scanf("%d",&opt);

printf("<执行操作:)\n");

printf("\n");

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\n");

printf("任意键结束……");

opt=0;

default:error();break;

}

}

return 0;

}

void menu()

{

printf("\n");

printf("操作列表:\n");

printf("1)一年级 2)二年级 3)三年级\n");

printf("4)帮助 5)退出程序\n");

}

void help()

{

printf("\n");

printf("帮助信息\n");

printf("您需要输入命令代号来进行操作,且\n");

printf("一年级题目为不超过十位的加减法\n");

printf("二年级题目为不超过百位的乘除法\n");

printf("三年级题目为不超过百位的加减乘除混合题目.\n");

}

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:\n");

scanf("%d",&n);

printf("<执行操作:)\n");

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\n",a,b,d);

    }

    else

    {

       d=a-b;

       printf("%d - %d = %d\n",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:\n");

scanf("%d",&n);

printf("<执行操作:)\n");

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\n",a,b,d);

       }

    else{

    while(b==0)

    {

        b=rand() % 10;

     }

       d=a/(b*1.0);

       printf("%d / %d = %g\n",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:\n");

scanf("%d",&n);

printf("<执行操作:)\n");

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\n",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\n",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\n",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\n",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\n",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\n",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\n",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\n",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\n",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\n",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\n",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\n",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\n",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\n",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\n",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\n",a,fh1,b,fh2,c,z);

    }

}

}

void error()

{

printf("Error!!!\n");

printf("错误操作指令, 请重新输入\n");

}

巴特西

C语言寒假大作战04

2.2.2 设计思路和遇到的问题

2.2.3 程序结果截图

2.2.4 程序代码截图

2.2.5 Gitee上传截图与链接

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