C++ Program to Print the Diagonals of a Matrix

Program 1

// Program for digonal elements of matrix 
#include<iostream>
#define clrscr() system("cls")
using namespace std;
int main()
{
     int a[50][50],r,c,m,n;
     clrscr();
    xyz:cout<<"\n Enter value of row and column";
    cin>>m>>n;
    if(m>50 || n>50)
     {
        cout<<"\nInvalid value pls enter again\n";
        goto xyz;
     }
     else
     {
            if(m!=n)
            {
                cout<<"Invalid Matrix for digonal elements\n";
            }
            else
           { 
             cout<<"\nEnter elements in matrix";
             for(r=0;r<m;r++)
             {
                for(c=0;c<n;c++)
                {
                    cin>>a[r][c];
                }
             }

            cout<<"\nMatrix elements :\n";
             for(r=0;r<m;r++)
             {
                for(c=0;c<n;c++)
                {
                    cout<<a[r][c]<<"\t";
                }
                cout<<"\n";
             }
            cout<<"\nDigonal elements of matrix :\n";
            //    for(r=0;r<m;r++)
            //   {
            //       cout<<a[r][r] <<"\t";
            //   }

              for(r=0;r<m;r++)
             {
                for(c=0;c<n;c++)
                {
                    if(r==c)
                    cout<<a[r][c]<<"\t";
                }
                cout<<"\n";
             }


          }

     }
}