Question

How to find the sum of each row and each column of a matrix (2D array) in Go

Answer 1

package main

import (
	"fmt"
)

func main() {
	arr := [3][4]int{
		{1, 2, 3, 5},
		{4, 5, 6, 5},
		{7, 8, 9, 5},
	}

	rows := len(arr)
	cols := len(arr[0])

	var sumRow, sumCol int
	for i := 0; i < rows; i++ {
		sumRow = 0
		for j := 0; j < cols; j++ {
			sumRow += arr[i][j]
		}
		fmt.Printf("Sum of row: %d = %d\n", i, sumRow)
	}

	for i := 0; i < cols; i++ {
		sumCol = 0
		for j := 0; j < rows; j++ {
			sumCol += arr[j][i]
		}
		fmt.Printf("Sum of col: %d = %d\n", i, sumCol)
	}
}



/*
run:

Sum of row: 0 = 11
Sum of row: 1 = 20
Sum of row: 2 = 29
Sum of col: 0 = 12
Sum of col: 1 = 15
Sum of col: 2 = 18
Sum of col: 3 = 15

*/

 

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