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四则运算.c
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四则运算.c
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#include<stdio.h>
#include<stdlib.h>
#include<time.h>
char getSignal(); //获取随机运算符的函数
int random(double,double); //获取随机数函数
int getResult(int,int,char); //结果计算函数
int takeTest(); //题目生成函数
void main()
{
int i,n,a,right=0;
double percent;
printf("请输入题目的数量:");
scanf("%d",&n);
for(i=0;i<n;i++)
{
a=takeTest();
right=right+a;
}
printf("回答正确!\n");
printf("正确答案为:%d\n",right);
percent=((double)right*100.00)/(double)n;
printf("正确率为:%0.2f %%\n",percent);
}
char getSignal()
{
char signal[4]={'+','-','*','/'};
srand((unsigned)time(NULL));
return signal[rand()%4];
}
int random(double start, double end)
{
return (int)(start+(end-start)*rand()/(RAND_MAX+ 1.0));
}
int getResult(int num1,int num2,char signal)
{
int res;
switch(signal)
{
case '+':
res=num1+num2;break;
case '-':
res=num1-num2;break;
case '*':
res=num1*num2;break;
case '/':
res=num1/num2;break;
default:
printf("运算符错误!\n");
}
return res;
}
int takeTest()
{
int get;
int num1,num2,a;
char signal;
srand((unsigned)time(NULL));
signal=getSignal();
num1=random(0,1000);
num2=random(1,1000);
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",&get);
fflush(stdin); //清空输入缓冲区
if(getResult(num1,num2,signal)==get)
{
printf("回答正确!\n");
a=1;
}
else
{
printf("回答错误!\n");
printf("正确答案为: %d\n",getResult(num1,num2,signal));
a=0;
}
return a;
}