C++打印三角形、四边形

电玩女神 2022-10-09 06:27 264阅读 0赞

### C++打印三角形、四边形 ###

用“\*“字符组成几种三角形、四边形

**1、打印等腰三角形**

![20210624105636959.png][]

**法一：**

//打印正三角形 
    #include <iostream>
    using namespace std;
     
    int main()
    {
    	int n = 4; //行数 
       	for (int i = 1; i <= n; i++) {
            for (int k = 0; k < n - i; k++) {
                cout << " ";
            }
            for (int j = 0; j < 2 * i - 1; j++) {
                cout << "*";
            }
            cout << endl;
        }
    
        return 0;
    }

**法二**

//打印三角形——简单
    #include <iostream>
    using namespace std;
    
    int main()
    {
        cout << "   *" << endl;
        cout << "  ***" << endl;
        cout << " *****" << endl;
        cout << "*******"<< endl;
           
        return 0;
    }

**2、打印倒等腰三角形**

![20210624105701246.png][]

**法一**

//打印倒三角形
    #include <iostream>
    using namespace std;
     
    int main()
    {
        int n = 4; //行数 
    	for (int i = n; i > 0; i--) {
            for (int k = 0; k < n - i; k++) {
                cout << " ";
            }
            for (int j = 0; j < 2 * i - 1; j++) {
                cout << "*";
            }
            cout << endl;
        }
        return 0;
    }

法二

//打印倒三角形——简单
    #include <iostream>
    using namespace std;
     
    int main()
    {
        cout << "*******"<< endl;
        cout << " *****" << endl;
        cout << "  ***" << endl;
    	cout << "   *" << endl;
           
        return 0;
    }

**3、打印直角三角形**

![20210624105738118.png][]

#include <iostream>
    using namespace std;
    
    int main(){
    	int n,i,j;
    	n = 4;  //行数 
    	for(i = 1;i <= n;i++){
    		for(j = 1;j <= i;j ++){
    			cout << "*";
    		}
    		
    		cout << endl;
    	}
    	
    	return 0; 
    }

**4、打印倒直角三角形**

![20210624105806702.png][]

#include <iostream>
    using namespace std;
    
    int main(){
    	int n,i,j;
    	n = 4;  //行数 
    	for(i = 1;i <= n;i++){
    		for(j = n;j >= i;j --){
    			cout << "*";
    		}
    		
    		cout << endl;
    	}
    	
    	return 0; 
    }

**5、打印矩形**

![20210624213110675.png][]

#include <iostream>
    using namespace std;
    
    int main(){
    	int n,i,j;
    	
    	n = 4; //行数 
    	for(i = 1;i <= n;i++){
    		for(j = 1;j <= n;j ++){
    			cout << "*";
    		}
    		cout << endl;
    	}
    	return 0; 
    }

**6、打印平行四边形**

![20210624213202574.png][]

#include <iostream>
    using namespace std;
    
    int main(){
    	int n,i,j;
    	
    	n = 4; //行数 
    	for(i = 1;i <= n;i++){
    		for(j = 1;j <= i - 1;j ++){
    			cout << " ";
    		}
    		for(j = 1;j <= n;j++){
    			cout << "*"; 
    		}
    		cout << endl;
    	}
    	return 0; 
    }

**7、打印菱形**

![20210624213337858.png][]

法一

#include<iostream>
    using namespace std;
    int main()
    {
    	int n = 4; //输入菱形的边长
     
    	//上半层
    	for (int i = 0; i < n; i++)   
     	{    
    		for (int j = 0; j < (n - 1) - i; j++) 
    		{   							    
    			cout << " "; 	    
    			}	     
    		        	
    		for (int j = 0; j < (2 * i + 1); j++)
    		{
    			cout << "*";
    		}
    		cout << endl;
    	}
     
    	//下半层
    	for (int i = 0; i < n - 1; i++)        
    	{
    		for (int j = 0; j < i + 1; j++)  
    		{
    			cout << " ";
    		}
    		
    	for (int j = 0; j < 2 * ( n - 1 ) - (1 + 2 * i); j++)
    		{ 
    			cout << "*";       
    		}
    			 	cout << endl;         
    	}
    	return 0;
    }

法二

#include <iostream>
    #include <stdlib.h>  //abs()用到 
    using namespace std;
    
    int M = 4; //菱形边长字符数 
    
    int f(int x, int y) {
    	return abs(x) + abs(y) < M;
    }
    
    int main() {
        for (int y = 1 - M; y < M; ++y) {
            for (int x = 1 - M; x < M; ++x) {
                cout << " *"[f(x, y)];
            }
        cout << endl;
        }
    	
    	return 0;
    }

[20210624105636959.png]: /images/20221005/e09fe8c04ae646aca57096f50bee7937.png
[20210624105701246.png]: /images/20221005/6e456e9bc4b04b49b4069fd77f52160a.png
[20210624105738118.png]: /images/20221005/3f0e367d06d74e59a6f7a85669445d5a.png
[20210624105806702.png]: /images/20221005/47aa0f8b461b4e95b8adc0d58eea7f4d.png
[20210624213110675.png]: /images/20221005/75faa9ad90fc4ed0a816f59d5d6ecd0d.png
[20210624213202574.png]: /images/20221005/3b556d0803be4bc9b835b3eb318977bb.png
[20210624213337858.png]: /images/20221005/dcda8377ccad408eb1ddfe73a3481a3e.png