Title: Yanghui triangle

#include<iostream>
using namespace std;
int main()
{
	int a[6][6];
	int i, j;
	for (i = 0; i < 6; i++)
	{
		a[i][0] = 1;
		a[i][i] = 1;
	}
	for(i=2;i<6;i++)
	{// There can be no brackets 
		// If there are no curly braces ,for Just execute the following sentence , And the following sentence is also for sentence , And then it went on 
		for (j = 1; j <i; j++)//j<i Control graphics （ The triangle looks like this ）
			a[i][j] = a[i - 1][j - 1] + a[i - 1][j];// The characteristics of Yanghui triangle 
	}
	for (i = 0; i < 6; i++)
	{
		for (j = 0; j <= i; j++)// ditto , Because the figure is a triangle .
			cout << a[i][j] << '\t';// This is used here '\t' More beautiful , If the spaces are not aligned 
		cout << endl;/*endl It means new line , front for After the loop is completed, only the following statement is executed （ Namely column ） When the number of this line is output, execute this sentence to wrap , If you will endl Write it after the output statement , Then every time a number is output, the line will be wrapped .*/	
	}
}

Say something the teacher said in class , No big difference , The only difference is that changing the number of rows is easier .

#include <iostream>
using namespace std;
int main()
{
	const int N = 6;
	int a[N][N];
	int i, j;
	for (i = 0; i < N; i++)
	{
		a[i][0] = 1;
		a[i][i] = 1;
	}
	for (i = 2; i < N; i++)
		for (j = 1; j < i; j++)
			a[i][j] = a[i - 1][j - 1] + a[i - 1][j];
	for (i = 0; i < N; i++)
	{
		for (j = 0; j <= i; j++)
			cout << a[i][j] << '\t';
		cout << endl;
	}
	return 0;
}