Program to print the upper left triangle of the array.

#include<iostream>
using namespace std;
int main()
{
int a[20][20],r,c;
cout<<"Enter the no. of rows:";
cin>>r;
cout<<"\nEnter the no. of Columns:";
cin>>c;
if(r>20 || c>20)
cout<<"\nInvalid input";
else
{
cout<<"\nEnter the "<<r*c<<" values:";
for(int i=0;i<r;i++)
for(int j=0;j<c;j++)
cin>>a[i][j];
cout<<"\nThe original Array is:";
for(int i=0;i<r;i++)
{
cout<<endl;
for(int j=0;j<c;j++)
cout<<" "<<a[i][j]<<" "<<"("<<i<<","<<j<<")";
}

cout<<"\nThe upper left triangle of original Array is:";
for(int i=0;i<r;i++)
{
cout<<endl;
for(int j=0;j<=2-i;j++)
cout<<" "<<a[i][j];
}

}
return 0;
}

By Ayush Gupta, Student