Golang Program To Print Star Pascals Triangle

Go Programming Server Side Programming Programming

In this tutorial, we will learn how to print star Pascal’s triangle using Go programming language

Example 1: Golang Code To Print Star Pascal Triangle Using Strconv Package

Syntax

func Itoa(x int) string

Itoa() function takes in an integer parameter and returns the string representation of x when the base is 10

Algorithm

Step 1 − Import the package fmt and strconv package.
Step 2 − Start function main ().
Step 3 − Declare and initialize the variables.
Step 4 − Use of for loop with condition and incrementor.
Step 5 − Print the result using fmt.Println ().

Example


// GOLANG PROGRAM TO PRINT STAR PASCALS TRIANGLE
package main

// fmt package provides the function to print anything
// Package strconv implements conversions to and from
// string representations of basic data types
import (
   "fmt"
   "strconv"
)

// start function main ()
func main() {

   // declare the variables
   var i, j, rows, num int
   
   // initialize the rows variable
   rows = 7
   
   // Scanln() function scans the input, reads and stores
   //the successive space-separated values into successive arguments
   fmt.Scanln(&rows)
   fmt.Println("GOLANG PROGRAM TO PRINT STAR PASCALS TRIANGLE")
   
   // Use of For Loop
   // This loop starts when i = 0
   // executes till i<rows condition is true
   // post statement is i++
   for i = 0; i < rows; i++ {
      num = 1
      fmt.Printf("%"+strconv.Itoa((rows-i)*2)+"s", "")
      
      // run next loop as for (j=0; j<=i; j++)
      for j = 0; j <= i; j++ {
         fmt.Printf("%4d", num)
         num = num * (i - j) / (j + 1)
      }
      
      fmt.Println()
      // print the result
   }
}

Output

GOLANG PROGRAM TO PRINT STAR PASCALS TRIANGLE
                 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

Description Of The Code

In the above program, we first declare the package main.
We imported the fmt package that includes the files of package fmt. We also imported Package strconv implements conversions to and from string representations of basic data types.
Now start the function main().
Declare the four integer variables i, j, num and rows. Initialize the rows variable to an integer value you want for Pascal’s triangle pattern. Use fmt.Scanln() to read and store the rows value.
Using for loop: The condition is given inside an if statement and stop execution is mentioned once the condition is right.
In the line 28 of the code: The loop starts when i = 0 and executes till i<rows condition is true and the post statement is i++.
In the line 32 of the code: it runs the next loop as for (j=0; j<=i; j++).
In this loop the function strconv.Itoa() is called for the calculation of pascal’s triangle.
And last printing the result in the form of a triangle on the screen using fmt.Println.

Conclusion

We have successfully compiled and executed the Golang program code to print star Pascal’s triangle in the above example.

Akhil Sharma

Updated on: 16-Nov-2022

416 Views

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