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SumOfPrimaryDiagonalInMatrix.java
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//WAP in java to define a method to return the sum of primary diagonal in matrix.
import java.util.Scanner;
public class SumOfPrimaryDiagonalInMatrix{
public static void main(String[] args) {
int mat[][] = readMatrix();
displayMatrix(mat);
int sum = sumOfPrimaryDiagonalInMatrix(mat);
System.out.println("The Sum Of Primary Diagonal In Matrix is : "+sum);
}
public static int[][] readMatrix()
{
Scanner sc = new Scanner(System.in);
System.out.println("Enter the number of rows you want : ");
int r = sc.nextInt();
System.out.println("Enter the number of column you want : ");
int c = sc.nextInt();
int mat[][] = new int[r][c];
System.out.println("Enter the "+r*c+" elements row wise : ");
for(int i=0;i<mat.length;i++)
{
for(int j=0;j<mat[i].length;j++)
{
mat[i][j] = sc.nextInt();
}
}
return mat;
}
public static void displayMatrix(int mat[][])
{
System.out.println("The user entered matrix is : ");
for(int i=0;i<mat.length;i++)
{
for(int j=0;j<mat[i].length;j++)
{
System.out.print(mat[i][j]+" ");
}
System.out.println();
}
}
public static int sumOfPrimaryDiagonalInMatrix(int mat[][])
{
int sum=0;
for(int i=0;i<mat.length;i++)
{
for(int j=0;j<mat[i].length;j++)
{
//if(mat[i][j]==mat[j][i])
if(i==j)
{
sum= sum+mat[i][j];
}
}
}
return sum;
}
}