Thank You @Sastava007. I'm adding this code just for review purpose and to help newcomers develope interest in programming. Here I've added a basic and interesting problem.

PRIME1.cpp

@@ -0,0 +1,37 @@
+#include<iostream>
+#include<math.h>
+using namespace std;
+/*This code is contributed by Sajal193. This is a basic level code that gives a 
+newbie a basic idea of implementation of nested loops and flow commands. ENJOY */
+int main(){
+    int t;
+    cin>>t;//for test cases
+    while(t--)
+    {
+        int m,n; //initializing two variables
+        cin>>m>>n;bool r; // using bool so as to check condition whether the second
+        //(nested) loop is executed or not.
+
+        for (int i =m; i<=n; i++)
+        {
+            if (i == 1 || i ==0) // if i equals 1 then skip to next increment
+            {
+                continue;
+            }
+            r = true;
+            for (int j =2; j<=sqrt(i); j++)//condition loop for checking prime number
+            { if (i%j == 0)
+               { r = false;
+                   break;
+               }
+            }
+
+            if ( r == true) // To check whether nested loop is traversed or not
+            {
+                cout<<i<<endl;
+            }
+
+        }
+    }
+    return 0;
+}