Question

How to generate pascal triangle in Java

Answer 1

// Each number in Pascal's triangle is the sum of the two numbers directly above it 

public class MyClass {
    public static void main(String args[]) {
        int rows = 7;

        for (int i = 0; i < rows; i++) {
            for (int space = 1; space < rows - i; space++) {
                System.out.print("  ");
            }
            
            int result = 1;
            for (int j = 0; j <= i; j++) {
                if (j == 0 || i == 0)
                    result = 1;
                else
                    result = result * (i - j + 1) / j;

                System.out.printf("%4d", result);
            }

            System.out.println();
        }
    }
}
  
  
  
  
/*
run:
  
               1
             1   1
           1   2   1
         1   3   3   1
       1   4   6   4   1
     1   5  10  10   5   1
   1   6  15  20  15   6   1
 
*/

 

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