计算与软件工程 作业2

作业要求<https://edu.cnblogs.com/campus/jssf/infor_computation17-31/homework/10402>

作业正文：

用C语言编写了简易程序，初步满足：

1.小学一、二、三、四、五年级的四则运算要求， 逐步实现各个年级的难度.

2.能够通过输入来选择不同年级，每个年级还得区分难，中，易三个等级

3.程序支持判断对错及累计得分.

4.一次可以出100道题目.

未能满足：

1.支持括号与多个运算符.

2.检查重复.

运行截图：

 

代码：

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define N 100
 
int OTTest1()
{
 int num = 0;
 int answer = 0;
 int result = 0;
 int m = 0;
 int n = 0;
 char op = 0;

int count = N;
 while ( count-- )
 {
 m = rand()%10 ;
 n = rand()%10 ;
 op = rand() % 4;

switch ( op )
 {
 case 0:
 op = '+';
 answer = m+n;
 break;
 case 1:
 op = '-';
 answer = m-n;
 break;
 case 2:
 op = '*';
 answer = m*n;
 break;
 case 3:
 n++;
 op = '/';
 answer = m/n;
 break;
 default:
 break;
 }
int number =100-count;

printf("
第%d题：",number);
 printf("%d%c%d=?
", m, op, n);
 printf("答案:");
 scanf("%d", &result);

if ( answer == result )
    
        {printf("正确
");
 num++;
}
if ( answer != result )
    printf("错误
");
 }
  printf("得分%d分",num);
 system("pause");
return num;
}

int OTTest2()
{
 int num = 0;
 int answer = 0;
 int result = 0;
 int m = 0;
 int n = 0;
 char op = 0;

int count = N;
 while ( count-- )
 {
 m = rand()%50 ;
 n = rand()%50 ;
 op = rand() % 4;

switch ( op )
 {
 case 0:
 op = '+';
 answer = m+n;
 break;
 case 1:
 op = '-';
 answer = m-n;
 break;
 case 2:
 op = '*';
 answer = m*n;
 break;
 case 3:
 n++;
 op = '/';
 answer = m/n;
 break;
 default:
 break;
 }
int number =100-count;

printf("
第%d题：",number);
 printf("%d%c%d=?
", m, op, n);
 printf("答案:");
 scanf("%d", &result);

if ( answer == result )
    
    {    printf("正确
");
num++;}
 
if ( answer != result )
    printf("错误
");
 }
  printf("得分%d分",num);
 system("pause");
return num;
}
int OTTest3()
{
 int num = 0;
 int answer = 0;
 int result = 0;
 int m = 0;
 int n = 0;
 char op = 0;

int count = N;
 while ( count-- )
 {
 m = rand()%100 ;
 n = rand()%100 ;
 op = rand() % 4;

switch ( op )
 {
 case 0:
 op = '+';
 answer = m+n;
 break;
 case 1:
 op = '-';
 answer = m-n;
 break;
 case 2:
 op = '*';
 answer = m*n;
 break;
 case 3:
 n++;
 op = '/';
 answer = m/n;
 break;
 default:
 break;
 }
int number =100-count;

printf("
第%d题：",number);
 printf("%d%c%d=?
", m, op, n);
 printf("答案:");
 scanf("%d", &result);

if ( answer == result ){
    
        printf("正确
");
 num++;
}
if ( answer != result )
    printf("错误
");
 }
 printf("得分%d分",num);
 system("pause");
return num;
}



int main()
{
    int grade,hard;
    printf("***********小学四则运算计算***********
");
    printf("
选择年级:1,2,3,4,5
");
    scanf("%d", &grade);
    printf("
选择难度:易=0，中=1，难=2
");
    scanf("%d", &hard);
if (grade==1||grade==2)
{
  switch ( hard )
  {
    case 0:
     hard = '1';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest1());
    return 0;
break;
    case 1:
     hard = '2';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest2());
    return 0;
break;
    case 2:
     hard = '3';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest3());
    return 0;
break;
 default:
 break;
  }
 }    
if (grade==3)
{
  switch ( hard )
  {
    case 0:
     hard = '1';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest1());
    return 0;
break;
    case 1:
     hard = '2';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest2());
    return 0;
break;
    case 2:
     hard = '3';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest3());
    return 0;
break;
 default:
 break;
  }
 }         
if (grade==4)
{
  switch ( hard )
  {
    case 0:
     hard = '1';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest1());
    return 0;
break;
    case 1:
     hard = '2';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest2());
    return 0;
break;
    case 2:
     hard = '3';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest3());
    return 0;
break;
 default:
 break;
  }
 }         
if (grade==5)
{
  switch ( hard )
  {
    case 0:
     hard = '1';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest1());
    return 0;
break;
    case 1:
     hard = '2';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest2());
    return 0;
break;
    case 2:
     hard = '3';
     srand( time(NULL) );
     printf("开始做题:
");
     printf("答题结束，你总共答对%d道题目。
", OTTest3());
    return 0;
break;
 default:
 break;
  }
 }    
}

作业2：

gitee托管链接：

https://gitee.com/hxf981221/gitee_yellow/blob/master/作业2.cpp#