问题标题: 飞速计算器1.34

@王子耀 看看这个代码

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经过1个星期的调试

飞速计算器1.34版终于出来了！

功能介绍：

可以输入四则运算和次方（小数是可以的）

会按照运算顺序计算，的数是小数（如果位数较多，可能会不精确）

**运算顺序**

1.次方（^）

2.乘，除（*，/）

3.加，减（+，-）

暂时还不能加括号，到暑假我会推出一个带括号的版本，大家拭目以待吧！

这是一次运行结果：

Please enter
请输入
1.257+1.234^5*1.35/1.078-1.83
=3.01036
Press Enter to retype
按回车键重新录入

由于编程平台有问题，输出的和DEVC++不一样，就只能用这个代码了：

#include<iostream>
#include<cstring>
#define clean (system("cls"))
#include<windows.h>
using namespace std; 
string a,b;
double c[1005];
bool check(){
    for(int i=0;i<b.size();i++){
        if(b[i]=='+'||b[i]=='-'||b[i]=='*'||b[i]=='/'||b[i]=='^'){
            return 1;
        }
    }
    return 0;
}
int findc(){
    for(int i=0;i<b.size();i++){
        if(b[i]=='^'){
            return i;
        }
    }
    return -1;
}
int find_(){
    for(int i=0;i<b.size();i++){
        if(b[i]=='+'||b[i]=='-'){
            return i;
        }
    }
    return 0;
}
int findx(){
    for(int i=0;i<b.size();i++){
        if(b[i]=='*'||b[i]=='/'){
            return i;
        }
    }
    return -1;
}
double change(string s){
    int l=0;
    for(int i=s.size()-1;i>=0;i--){
        if(s[i]=='.'){
            l=s.size()-1-i;
        }
    }
    int f=1,idx=0;
    for(int i=s.size()-1;i>=0;i--){
        if(s[i]!='.'){
            idx+=(s[i]-'0')*f;
            f*=10;
        }
    }
    if(l==0)return idx;
    int t=10;
    for(int i=1;i<l;i++)t*=10;
    return idx*1.0/t;
} 
string change2(int tx){
    int b[105],l=0,x=tx;
    while(x!=0){
        l++;
        b[l]=x%10;
        x/=10;
    }
    string out="";
    for(int i=l;i>=1;i--)out=out+char(b[i]+'0');
    return out;
}
bool check2(string t){
    for(int i=0;i<t.size();i++){
        if(!((t[i]>='0'&&t[i]<='9')||t[i]=='+'||t[i]=='-'||t[i]=='*'||t[i]=='/'||t[i]=='.'||t[i]=='^')){
            return 1;
        }
    }
    return 0;
}
void wrong(){
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);//红色
    cout<<"Input error\n输入错误";
    Sleep(1500);
}
int main(){
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |FOREGROUND_BLUE);//青色
    cout<<"Welcome to the quick calculator!\n";
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED |FOREGROUND_GREEN);//黄色 
    cout<<"欢迎使用飞速计算器！";
    Sleep(2000);
    clean; 
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED |FOREGROUND_GREEN);//黄色 
    cout<<"!";
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);//红色
    cout<<"Only four operations and powers can be entered,no parentheses";
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED |FOREGROUND_GREEN);//黄色 
    cout<<"!\n!";
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED);//红色
    cout<<"只能输入四则运算和次方，不能输入括号";
    SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED |FOREGROUND_GREEN);//黄色 
    cout<<"!\n";
    Sleep(3000);
    while(1){
        clean;
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |FOREGROUND_BLUE);//青色
        cout<<"Please enter\n";
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED |FOREGROUND_GREEN);//黄色 
        cout<<"请输入\n";
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED |FOREGROUND_GREEN | FOREGROUND_BLUE);//白色 
        cin>>a;
        if(check2(a)){
            wrong();
            continue;
        }
        b="";
        int go=-1;
        int l=0;
        for(int i=0;i<a.size();i++){
            if(a[i]>='0'&&a[i]<='9'){
                if(i>go){
                    l++;
                int j;
                for(j=i+1;j<a.size();j++){
                    if(a[j]=='+'||a[j]=='-'||a[j]=='*'||a[j]=='/'||a[j]=='^'){
                        j--;
                        break;
                    }
                }
                if(j==a.size())j--;
                //cout<<i<<" "<<j<<"\n";
                go=j;
                string t=a.substr(i,j-i+1);
                c[l]=change(t);
                b=b+change2(l);
                }
            }
            else if(a[i]!='.'){
                b=b+a[i];
            }
        }
        //cout<<b<<"\n";
        bool con=0;
        while(check()){
            int u;
            u=findc();
            if(u==-1)u=findx();
            if(u==-1)u=find_();
            int j1,j2;
            for(j1=u-1;j1>=0;j1--){
                if(b[j1]=='+'||b[j1]=='-'||b[j1]=='*'||b[j1]=='/'||b[j1]=='^'){
                    j1++;
                    break;
                }
            }
            if(j1==-1)j1=0;
            for(j2=u+1;j2<b.size();j2++){
                if(b[j2]=='+'||b[j2]=='-'||b[j2]=='*'||b[j2]=='/'||b[j2]=='^'){
                    j2--;
                    break;
                }
            }
            if(j2==b.size())j2--;
            string ta=b.substr(j1,u-j1),tb=b.substr(u+1,j2-u);
            double t;
            double t1=c[int(change(ta))],t2=c[int(change(tb))];
            if(b[u]=='^'){
                double tmp=t1;
                int cs=t2;
                if(cs!=t2){
                    con=1;
                    break;
                }
                for(int i=1;i<cs;i++){
                    tmp*=t1;
                }
                t=tmp;
            }
            if(b[u]=='+')t=t1+t2;
            if(b[u]=='-')t=t1-t2;
            if(b[u]=='*')t=t1*t2;
            if(b[u]=='/')t=t1/t2;
            b.erase(j1,j2-j1+1);
            l++;
            c[l]=t;
            b.insert(j1,change2(l));
            //cout<<b<<"\n";
        }
        if(con){
            wrong();
            continue;
        }
        cout<<"="<<c[int(change(b))]<<"\n";
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_GREEN |FOREGROUND_BLUE);//青色
        cout<<"Press Enter to retype\n";
        SetConsoleTextAttribute(GetStdHandle(STD_OUTPUT_HANDLE), FOREGROUND_INTENSITY | FOREGROUND_RED |FOREGROUND_GREEN);//黄色 
        cout<<"按回车键重新录入\n";
        getchar();
        getchar();
    }
    return 0;
}

如果有问题，欢迎在下方指出噢~