Add the program to find the next prime number given a number by the user

NextPrime.cpp

@@ -0,0 +1,37 @@
+// Program to fing the imediate next prime number of a given number
+
+#include<iostream>
+using namespace std;
+
+bool isPrime(long long num) {
+
+    if (num == 2 || num == 3)
+        return true;
+    if (num % 2 == 0 || num % 3 == 0)
+        return false;
+
+    int factor = 6;
+
+    while (factor * factor - 2 * factor + 1 <= num) {
+        if (num % (factor - 1) == 0)
+            return false;
+        if (num % (factor + 1) == 0)
+            return false;
+
+        factor += 6;
+
+    }
+
+    return true;
+
+}
+
+int main()
+{
+    long long num;
+    cout << "Please select a number to find the next greater prime!" << endl;
+    cin >> num;
+    while (!isPrime(++num)) {}
+    cout << "The next prime is " << num << "!" << endl;
+    return 0;
+}