Added code to print Lower and upper half of a triangle matrix

Code to Print Lower half and Upper half of Triangle Matrix.cpp

@@ -0,0 +1,53 @@
+// C++ Program to Print Lowerhalf and Upperhalf of Triangle Matrix
+
+
+#include<iostream>
+
+using namespace std;
+
+int main()
+{
+    int a[10][10],i,j,m;
+    cout<<"Enter size of the Matrix(min:3,max:5):";
+    cin>>m;
+    cout<<"\nEnter the Matrix row wise:\n";
+
+    for(i=0;i<m;i++)
+        for(j=0;j<m;++j)
+            cin>>a[i][j];
+
+    cout<<"\n\n";
+
+    cout<<"Upperhalf  of  Triangle Matrix :: \n";
+
+    for(i=0;i<m;++i)
+    {
+        for(j=0;j<m;++j)
+        {
+            if(i<j)
+                cout<<a[i][j]<<" ";
+            else
+                cout<<"  ";
+        }
+
+        cout<<"\n";
+    }
+
+    cout<<"\n";
+
+    cout<<"Lowerhalf  of  Triangle Matrix :: \n";
+
+    for(i=0;i<m;++i)
+    {
+        for(j=0;j<m;++j)
+        {
+            if(j<i)
+                cout<<a[i][j]<<" ";
+            else
+                cout<<" ";
+        }
+        cout<<"\n";
+    }
+
+    return 0;
+}

Find Sum of Diagonals elements in a Matrix.cpp

@@ -0,0 +1,49 @@
+/*  C++ Program to Find Sum of Diagonals elements in a Matrix  */
+
+#include<iostream>
+
+using namespace std;
+
+int main()
+{
+    int a[10][10],d1sum=0,d2sum=0,m,i,j;
+    cout<<"Enter size of matrix :: ";
+    cin>>m;
+    cout<<"\nEnter Elements to Matrix Below :: \n";
+
+    for(i=0;i<m;i++)
+    {
+        for(j=0;j<m;++j)
+        {
+            cout<<"\nEnter a["<<i<<"]["<<j<<"] Element :: ";
+            cin>>a[i][j];
+        }
+
+    }
+
+    cout<<"\nThe given matrix is :: \n\n";
+        for (i = 0; i < m; ++i)
+        {
+            for (j = 0; j < m; ++j)
+            {
+                cout<<"\t"<<a[i][j];
+            }
+            printf("\n\n");
+        }
+
+
+
+    for(i=0;i<m;++i)
+        for(j=0;j<m;++j)
+        {
+            if(i==j)
+                d1sum+=a[i][j];
+            if(i+j==(m-1))
+                d2sum+=a[i][j];
+        }
+
+    cout<<"\nSum of 1st diagonal is :: "<<d1sum;
+    cout<<"\n\nSum of 2nd diagonal is :: "<<d2sum;
+
+    return 0;
+}