四则运算程序-作业

| 博客班级 | https://edu.cnblogs.com/campus/ahgc/AHPU-SE-19 |
| 作业要求 | https://edu.cnblogs.com/campus/ahgc/AHPU-SE-19/homework/11376|
| 作业目标 | 写一个能自动生成小学四则运算题目的程序 |
| 学号 | 3190704240|
源代码如下：

include <stdio.h>

include <ctype.h>

include <time.h>

include <stdlib.h>

include <windows.h>

define IDNO_LENGTH 6

define CALC_KIND 4

char getSignal();
int getResult(int,int,char);
void takeTest();
void falsePrint(int);
void correctPrint(int);

//main函数
void main()
{
while(1)
{
takeTest();
}
}

//获取随机运算符
char getSignal()
{
char signal[CALC_KIND]={'+','-','*','/'};
srand((unsigned)time(NULL));
return signal[rand()%4];
}

//获取随机数
int random(double start, double end)
{
return (int)(start+(end-start)*rand()/(RAND_MAX+ 1.0));
}

//运算
int getResult(int num1,int num2,char signal)
{
int res;
switch(signal)
{
case '+':
res=num1+num2;break;
case '-':
res=num1-num2;break;
case '':
res=num1num2;break;
case '/':
res=num1/num2;break;
default:
res=0;
printf("运算符不符合规则\n");
}
return res;
}

//列出题目

void takeTest()
{
int giveRes;
int num1;
int num2;
char signal;
int printFlag;

srand((unsigned)time(NULL));
signal=getSignal();
num1=random(0,100);
num2=random(1,100);


if(signal=='-')
{
    if(num1<num2)
    {
        int temp;
        temp=num1;
        num1=num2;
        num2=temp;
    }
}


if(signal=='/')
{
    if(num2==0)
    {
        int temp;
        temp=num1;
        num1=num2;
        num2=temp;
    }
}


printf("%d%c%d=",num1,signal,num2);
scanf("%d",&giveRes);
fflush(stdin);


if(getResult(num1,num2,signal)==giveRes)
{
    printFlag=random(1,5);
    correctPrint(printFlag);
}
else
{
    printFlag=random(1,4);
    falsePrint(printFlag);
    printf("正确答案：%d\n",getResult(num1,num2,signal));
}

}

//回答正确打印信息
void correctPrint(int num)
{
switch(num)
{
case 1:
printf("You're right!\n");break;
case 2:
printf("It's OK!\n");break;
case 3:
printf("Correct!\n");break;
case 4:
printf("Perfect!\n");break;
case 5:
printf("Good!\n");break;
default:
printf("Powerful!\n");break;
}
}

//回答错误打印信息
void falsePrint(int num)
{
switch(num)
{
case 1:
printf("You're lost!");break;
case 2:
printf("Failure!");break;
case 3:
printf("Come on!");break;
case 4:
printf("It's wrong!");break;
default:
printf("Incorrect!");break;
}
}
运行截图：

PSP:

总结：
这次题目感觉很难，经过查阅相关资料，百度以及CSDN后，我学到了很多实用的方法，然而这个程序仍然具有很多问题，比想象中的更为复杂，说明我的能力还很弱，还需要更多的学习。