蓝桥杯之01字符串

方法一：

#include <iostream>
using namespace std;
int main()
{
    cout<<"00000"<<endl;
    cout<<"00001"<<endl;
    cout<<"00010"<<endl;
    cout<<"00011"<<endl;
    cout<<"00100"<<endl;
    cout<<"00101"<<endl;
    cout<<"00110"<<endl;
    cout<<"00111"<<endl;
    cout<<"01000"<<endl;
    cout<<"01001"<<endl;
    cout<<"01010"<<endl;
    cout<<"01011"<<endl;
    cout<<"01100"<<endl;
    cout<<"01101"<<endl;
    cout<<"01110"<<endl;
    cout<<"01111"<<endl;
    cout<<"10000"<<endl;
    cout<<"10001"<<endl;
    cout<<"10010"<<endl;
    cout<<"10011"<<endl;
    cout<<"10100"<<endl;
    cout<<"10101"<<endl;
    cout<<"10110"<<endl;
    cout<<"10111"<<endl;
    cout<<"11000"<<endl;
    cout<<"11001"<<endl;
    cout<<"11010"<<endl;
    cout<<"11011"<<endl;
    cout<<"11100"<<endl;
    cout<<"11101"<<endl;
    cout<<"11110"<<endl;
    cout<<"11111"<<endl;
    return 0;
}

方法二：

int main()
{
    for(int a=0;a<=1;a++)
    {
        for(int b=0;b<=1;b++)
        {
            for(int c=0;c<=1;c++)
            {
                for(int d=0;d<=1;d++)
                {
                    for(int e=0;e<=1;e++)
                        cout<<a<<b<<c<<d<<e<<endl;
                }
            }
        }
    }
	return 0;
}

方法三：

#include<bits/stdc++.h>
#define PI atan(1.0)*4
using namespace std;
/*char a[16][5]={"0000","0001","0010","0011","0100","0101","0110","0111",
                 "1000","1001","1010","1011","1100","1101","1110","1111"};*/
int main()
{
    string s="00000";
    for(int i=0;i<32;i++)
    {
        cout<<s<<endl;
        s[4]+=1;
        for(int j=4;j>=0;j--)
        {
            if(s[j]=='2')
            {
                s[j-1]+=1;
                s[j]='0';
            }
        }
    }
	return 0;
}

关于string的一点解释：

int main()
{
    string s="00000";
    s[4]+=1;//实际上是ASCII码相加，‘0’对应的ASCII码是48，执行加1操作后变为49
    cout<<s<<endl;//输出结果00001，s[4]是ASCII码为49对应的字符
	return 0;
}

int main()
{
    string s="00000";
    s[4]+='1';//’0‘的ASCII码为48，’1‘的ASCII码为49，相加后为97
    cout<<s<<endl;//输出结果为000a，s[4]是ASCII码为97对应的字符
	return 0;
}

附上string的用法：(https://blog.csdn.net/qq_37941471/article/details/82107077)