四则运算（第二版）
结对编程伙伴：栾骄阳
功能1. 四则运算
支持出题4个数的四则运算题目
#include<stdio.h>
#include<stack>
#include<stdlib.h>
#include<string>
#include<math.h>
using namespace std;
struct Number
{
double a;
bool b;//0数字 1字符
};
stack<Number>s3;
void houzhuibds(char str[100])//后缀表达式
{
stack<char>s1;
stack<Number>s2;
int i=0,j=0;
for(i=0;str[i]!='\0';i++)
{
if(str[i]>='0'&&str[i]<='9')
{
Number num;
num.a=0;
num.b=0;
while(str[i]<='9'&&str[i]>='0')
num.a=(str[i++]-'0')+num.a*10;
s2.push(num);
i--;
}
else
{
if(str[i]==')')
{
while(s1.top()!='(')
{
Number num;
num.b=1;
num.a=s1.top();
s2.push(num);
s1.pop();
}
s1.pop();
}
else if(s1.empty()||s1.top()=='('||str[i]=='(')
{
s1.push(str[i]);
}
else
{
if((str[i]=='*'||str[i]=='/')&&(s1.top()=='+'||s1.top()=='-'))
s1.push(str[i]);
else
{
Number num;
num.b=1;
num.a=s1.top();
s2.push(num);
s1.pop();
i--;
}
}
}
}
while(!s1.empty())
{
Number num;
num.b=1;
num.a=s1.top();
s2.push(num);
s1.pop();
}
while(!s2.empty())
{
s3.push(s2.top());
s2.pop();
}
/*
while(!s3.empty())
{
Number num=s3.top();
s3.pop();
if(num.b==0)
printf("%d",num.a);
else
printf("%c",num.a);
}
printf("\n");
*/
}
double qiuzhi()
{
stack<double>s4;
while(!s3.empty())
{
Number c1=s3.top();
s3.pop();
if(c1.b==0)
s4.push(c1.a);
else
{
double c2=s4.top();
s4.pop();
double c3=s4.top();
s4.pop();
double c4;
switch((int)c1.a)
{
case '+':c4=c3+c2;break;
case '-':c4=c3-c2;break;
case '*':c4=c3*c2;break;
case '/':c4=c3/c2;break;
}
s4.push(c4);
}
}
return s4.top();
}
void afterfh(char str[100],int t,int n);//+-*/之后
void aftersz(char str[100],int t,int n);
int main()
{
char str[100];
int s=0;
for(int i=0;i<20;i++)
{
int t=0;
int n=0;
afterfh(str,t,n);
//gets(str);//4个数3个符号
houzhuibds(str);
double ans=qiuzhi();
for(int i=0;str[i]!='\0';i++)
printf("%c",str[i]);
printf("=\n?");
double s;
scanf("%lf",&s);
if(abs(s-ans)<0.01)
{
s++;
printf("答对了，你真是天才\n");
}
else
printf("再想想吧，答案似乎是%.2lf喔!\n",ans);
}
printf("你一共答对%d道题，共20道题。\n",s);
return 0;
}
void aftersz(char str[100],int t,int n)
{
int num=rand()%4;
switch(num)
{
case 0:str[t]='+';break;
case 1:str[t]='-';break;
case 2:str[t]='*';break;
case 3:str[t]='/';break;
}
afterfh(str,++t,n);
}
void afterfh(char str[100],int t,int n)//+-*/之后
{
int num=rand()%100;
if(num>=10)
{
int a=num%10;
str[t++]=num/10+'0';
str[t]=a+'0';
}
else
str[t]='0'+num;
n++;
if(n==4)
{
str[++t]='\0';
return ;
}
t++;
aftersz(str,t,n);
}
功能2：支持括号
代码：
#include<stdio.h>
#include<stack>
#include<stdlib.h>
#include<string>
#include<string.h>
#include<math.h>
using namespace std;
int y=0;
struct Number
{
double a;
bool b;//0数字 1字符
};
stack<Number>s3;
void houzhuibds(char str[100])//后缀表达式
{
stack<char>s1;
stack<Number>s2;
int i=0,j=0;
for(i=0;str[i]!='\0';i++)
{
if(str[i]>='0'&&str[i]<='9')
{
Number num;
num.a=0;
num.b=0;
while(str[i]<='9'&&str[i]>='0')
num.a=(str[i++]-'0')+num.a*10;
s2.push(num);
i--;
}
else
{
if(str[i]==')')
{
while(s1.top()!='(')
{
Number num;
num.b=1;
num.a=s1.top();
s2.push(num);
s1.pop();
}
s1.pop();
}
else if(s1.empty()||s1.top()=='('||str[i]=='(')
{
s1.push(str[i]);
}
else
{
if((str[i]=='*'||str[i]=='/')&&(s1.top()=='+'||s1.top()=='-'))
s1.push(str[i]);
else
{
Number num;
num.b=1;
num.a=s1.top();
s2.push(num);
s1.pop();
i--;
}
}
}
}
while(!s1.empty())
{
Number num;
num.b=1;
num.a=s1.top();
s2.push(num);
s1.pop();
}
while(!s2.empty())
{
s3.push(s2.top());
s2.pop();
}
}
double qiuzhi()
{
stack<double>s4;
while(!s3.empty())
{
Number c1=s3.top();
s3.pop();
if(c1.b==0)
s4.push(c1.a);
else
{
double c2=s4.top();
s4.pop();
double c3=s4.top();
s4.pop();
double c4;
switch((int)c1.a)
{
case '+':c4=c3+c2;break;
case '-':c4=c3-c2;break;
case '*':c4=c3*c2;break;
case '/':c4=c3/c2;break;
}
s4.push(c4);
}
}
return s4.top();
}
void afterfh(char str[100],int t,int n);//+-*/之后
void aftersz(char str[100],int t,int n);
int main()
{
char str[100];
int s=0;
for(int i=0;i<20;i++)
{
int t=0;
int n=0;
afterfh(str,t,n);
int len=strlen(str);
while(y)
{
if(str[len-2]=='(')
{
str[len-2]=str[len-1];
len--;
}
else if(str[len-3]=='(')
{
str[len-3]=str[len-2];
str[len-2]=str[len-1];
len--;
}
else
str[len++]=')';
y--;
}
str[len]='\0';
houzhuibds(str);
double ans=qiuzhi();
for(int i=0;str[i]!='\0';i++)
printf("%c",str[i]);
printf("=\n?");
double s;
scanf("%lf",&s);
if(abs(s-ans)<0.01)
{
s++;
printf("答对了，你真是天才\n");
}
else
printf("再想想吧，答案似乎是%.2lf喔!\n",ans);
}
printf("你一共答对%d道题，共20道题。\n",s);
return 0;
}
void aftersz(char str[100],int t,int n)//数字后面是+-/*(0-4) 右括号(5-9)
{
int i=rand()%10;
if(i<=4)
{
int j=rand()%4;
switch(j)
{
case 0:str[t]='+';break;
case 1:str[t]='-';break;
case 2:str[t]='*';break;
case 3:str[t]='/';break;
}
afterfh(str,++t,n);
}
else//右括号
{
if(y>0&&(str[t-2]!='('||str[t-3]!='('&&(str[t-2]<='0'&&str[t-2]>='9')))
{
str[t]=')';
y--;
aftersz(str,++t,n);
}
else
aftersz(str,t,n);
}
}
void afterfh(char str[100],int t,int n)//+-*/之后
{
int p=rand()%10;
if(p>=3)//数字
{
int num=rand()%100;
if(num>=10)
{
int a=num%10;
str[t++]=num/10+'0';
str[t]=a+'0';
}
else
str[t]='0'+num;
n++;
if(n==4)
{
str[++t]='\0';
return ;
}
aftersz(str,++t,n);
}
else//左括号
{
str[t]='(';
y++;
afterfh(str,++t,n);
}
}
功能3：限定题目数量，"精美"打印输出
输入：
打印结果：
代码：
#include<stdio.h>
#include<stack>
#include<stdlib.h>
#include<string>
#include<string.h>
#include<math.h>
using namespace std;
int y=0;
struct Number
{
double a;
bool b;//0数字 1字符
};
stack<Number>s3;
void houzhuibds(char str[100])//后缀表达式
{
stack<char>s1;
stack<Number>s2;
int i=0,j=0;
for(i=0;str[i]!='\0';i++)
{
if(str[i]>='0'&&str[i]<='9')
{
Number num;
num.a=0;
num.b=0;
while(str[i]<='9'&&str[i]>='0')
num.a=(str[i++]-'0')+num.a*10;
s2.push(num);
i--;
}
else
{
if(str[i]==')')
{
while(s1.top()!='(')
{
Number num;
num.b=1;
num.a=s1.top();
s2.push(num);
s1.pop();
}
s1.pop();
}
else if(s1.empty()||s1.top()=='('||str[i]=='(')
{
s1.push(str[i]);
}
else
{
if((str[i]=='*'||str[i]=='/')&&(s1.top()=='+'||s1.top()=='-'))
s1.push(str[i]);
else
{
Number num;
num.b=1;
num.a=s1.top();
s2.push(num);
s1.pop();
i--;
}
}
}
}
while(!s1.empty())
{
Number num;
num.b=1;
num.a=s1.top();
s2.push(num);
s1.pop();
}
while(!s2.empty())
{
s3.push(s2.top());
s2.pop();
}
}
double qiuzhi()
{
stack<double>s4;
while(!s3.empty())
{
Number c1=s3.top();
s3.pop();
if(c1.b==0)
s4.push(c1.a);
else
{
double c2=s4.top();
s4.pop();
double c3=s4.top();
s4.pop();
double c4;
switch((int)c1.a)
{
case '+':c4=c3+c2;break;
case '-':c4=c3-c2;break;
case '*':c4=c3*c2;break;
case '/':c4=c3/c2;break;
}
s4.push(c4);
}
}
return s4.top();
}
void afterfh(char str[100],int t,int n);//+-*/之后
void aftersz(char str[100],int t,int n);
int main()
{
FILE *fp;
fp=fopen("D:\\2.txt","w");
char str[100];
char s[100];
int z=0;
while(1)
{
int k=0,flag=0;
scanf("%s",&s);
while(s[k]!='\0')
{
if(s[k]>='0'&&s[k]<='9')
z=z*10+s[k]-'0';
else
{
flag=1;
break;
}
k++;
}
if(flag==1)
printf("题目数量必须是 正整数。\n");
else
break;
}
getchar();
for(int i=0;i<z;i++)
{
int t=0;
int n=0;
afterfh(str,t,n);
int len=strlen(str);
while(y)
{
if(str[len-2]=='(')
{
str[len-2]=str[len-1];
len--;
}
else if(str[len-3]=='(')
{
str[len-3]=str[len-2];
str[len-2]=str[len-1];
len--;
}
else
str[len++]=')';
y--;
}
str[len]='\0';
houzhuibds(str);
double ans=qiuzhi();
fprintf(fp,"%25s",str);
fprintf(fp,"= %.2lf\n",ans);
}
return 0;
}
void aftersz(char str[100],int t,int n)//数字后面是+-/*(0-4) 右括号(5-9)
{
int i=rand()%10;
if(i<=4)
{
int j=rand()%4;
switch(j)
{
case 0:str[t]='+';break;
case 1:str[t]='-';break;
case 2:str[t]='*';break;
case 3:str[t]='/';break;
}
afterfh(str,++t,n);
}
else//右括号
{
if(y>0&&(str[t-2]!='('||str[t-3]!='('&&(str[t-2]<='0'&&str[t-2]>='9')))
{
str[t]=')';
y--;
aftersz(str,++t,n);
}
else
aftersz(str,t,n);
}
}
void afterfh(char str[100],int t,int n)//+-*/之后
{
int p=rand()%10;
if(p>=3)//数字
{
int num=rand()%100;
if(num>=10)
{
int a=num%10;
str[t++]=num/10+'0';
str[t]=a+'0';
}
else
str[t]='0'+num;
n++;
if(n==4)
{
str[++t]='\0';
return ;
}
aftersz(str,++t,n);
}
else//左括号
{
str[t]='(';
y++;
afterfh(str,++t,n);
}
}
功能4：未完成
conding.net git@git.coding.net:w547240561/myboke.git
https://git.coding.net/w547240561/myboke.git
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