Added PrintWave program with proper comments

Array/PrintWave.cpp

@@ -0,0 +1,65 @@
+// Given a 2D array. Print the elements of the array in a wave form row-wise and columnwise.
+
+// For example if the array is given as:
+//     1   2   3   4                  
+//     5   6   7   8     
+//     9   10  11  12
+//     13  14  15  16                     
+
+//   Row-wise O/P:     1,2,3,4,8,7,6,5,9,10,11,12,16,15,14,13
+//   Column-wise O/P:  1,5,9,13,14,10,6,2,3,7,11,15,16,12,8,4
+
+#include<bits/stdc++.h>
+using namespace std;
+
+void row_wise(int a[][100], int n, int m){
+    for(int i=0;i<n;i++){
+        if(i%2 == 0){
+            //left to right
+            for(int j=0; j<m; j++){
+                cout<<a[i][j]<<" ";
+            }
+        }
+        else{
+            //right to left
+            for(int j=m-1; j>=0; j--){
+                cout<<a[i][j]<<" ";
+            }
+        }
+    }
+}
+void column_wise(int a[][100], int n, int m){
+    for(int j=0;j<m;j++){
+        if(j%2==0){
+            //up to bottom
+            for(int i=0; i<n; i++){
+                cout<<a[i][j]<<" ";
+            }
+        }
+        else{
+            //bottom to up
+            for(int i=n-1; i>=0 ;i--){
+                cout<<a[i][j]<<" ";
+            }
+        }
+    }
+}
+int main(){
+
+    //Dimensions of 2D array
+    int n,m;
+    cin>>n>>m;
+    int a[100][100] = {0};
+    for(int i=0;i<n;i++){
+        for(int j=0;j<m;j++){
+            cin>>a[i][j];
+        }
+    }
+
+    row_wise(a,n,m);
+    cout<<endl;
+    column_wise(a,n,m);
+    cout<<endl;
+
+    return 0;
+}