C++ 实例 – 创建各类三角形图案

#include <iostream>
using namespace std;
 
int main()
{
    int rows;
 
    cout << "输入行数: ";
    cin >> rows;
 
    for(int i = 1; i <= rows; ++i)
    {
        for(int j = 1; j <= i; ++j)
        {
            cout << "* ";
        }
        cout << "\n";
    }
    return 0;
}

#include <iostream>
using namespace std;
 
int main()
{
    int rows;
 
    cout << "输入行数: ";
    cin >> rows;
 
    for(int i = 1; i <= rows; ++i)
    {
        for(int j = 1; j <= i; ++j)
        {
            cout << j << " ";
        }
        cout << "\n";
    }
    return 0;
}

#include <iostream>
using namespace std;
 
int main()
{
    char input, alphabet = 'A';
 
    cout << "输入最后一个大写字母: ";
    cin >> input;
 
    for(int i = 1; i <= (input-'A'+1); ++i)
    {
        for(int j = 1; j <= i; ++j)
        {
            cout << alphabet << " ";
        }
        ++alphabet;
 
        cout << endl;
    }
    return 0;
}

#include <iostream>
using namespace std;
 
int main()
{
    int rows;
 
    cout << "输入行数: ";
    cin >> rows;
 
    for(int i = rows; i >= 1; --i)
    {
        for(int j = 1; j <= i; ++j)
        {
            cout << "* ";
        }
        cout << endl;
    }
    
    return 0;
}

#include <iostream>
using namespace std;
 
int main()
{
    int rows;
 
    cout << "输入行数: ";
    cin >> rows;
 
    for(int i = rows; i >= 1; --i)
    {
        for(int j = 1; j <= i; ++j)
        {
            cout << j << " ";
        }
        cout << endl;
    }
 
    return 0;
}

#include <iostream>
using namespace std;
 
int main()
{
    int space, rows;
 
    cout <<"输入行数: ";
    cin >> rows;
 
    for(int i = 1, k = 0; i <= rows; ++i, k = 0)
    {
        for(space = 1; space <= rows-i; ++space)
        {
            cout <<"  ";
        }
 
        while(k != 2*i-1)
        {
            cout << "* ";
            ++k;
        }
        cout << endl;
    }    
    return 0;
}

#include <iostream>
using namespace std;
 
int main()
{
    int rows, count = 0, count1 = 0, k = 0;
 
    cout << "输入行数: ";
    cin >> rows;
 
    for(int i = 1; i <= rows; ++i)
    {
        for(int space = 1; space <= rows-i; ++space)
        {
            cout << "  ";
            ++count;
        }
 
        while(k != 2*i-1)
        {
            if (count <= rows-1)
            {
                cout << i+k << " ";
                ++count;
            }
            else
            {
                ++count1;
                cout << i+k-2*count1 << " ";
            }
            ++k;
        }
        count1 = count = k = 0;
 
        cout << endl;
    }
    return 0;
}

#include <iostream>
using namespace std;
 
int main()
{
    int rows;
 
    cout << "输入行数: ";
    cin >> rows;
 
    for(int i = rows; i >= 1; --i)
    {
        for(int space = 0; space < rows-i; ++space)
            cout << "  ";
 
        for(int j = i; j <= 2*i-1; ++j)
            cout << "* ";
 
        for(int j = 0; j < i-1; ++j)
            cout << "* ";
 
        cout << endl;
    }
 
    return 0;
}

#include <iostream>
using namespace std;
 
int main()
{
    int rows, coef = 1;
 
    cout << "Enter number of rows: ";
    cin >> rows;
 
    for(int i = 0; i < rows; i++)
    {
        for(int space = 1; space <= rows-i; space++)
            cout <<"  ";
 
        for(int j = 0; j <= i; j++)
        {
            if (j == 0 || i == 0)
                coef = 1;
            else
                coef = coef*(i-j+1)/j;
 
            cout << coef << "   ";
        }
        cout << endl;
    }
 
    return 0;
}

#include <iostream>
using namespace std;
 
int main()
{
    int rows, number = 1;
 
    cout << "输入行数: ";
    cin >> rows;
 
    for(int i = 1; i <= rows; i++)
    {
        for(int j = 1; j <= i; ++j)
        {
            cout << number << " ";
            ++number;
        }
 
        cout << endl;
    }
 
    return 0;
}