truncated_square_root.cpp: Solves issue matthewsamuel95#150

Added cpp file for calculating root using library functions sqrt and
floor. Will solve issue matthewsamuel95#150.

Author: mouri11

Math/truncated_square_root/a.out

@@ -0,0 +1,15 @@
+#include <iostream>
+#include <cstdio>
+#include <cstdlib>
+#include <cmath>
+
+using namespace std;
+
+int main() {
+    double a = 0;
+    cout<<"Enter an integer:"<<endl;
+    cin>>a;
+    if (a <= 0) return 0;
+    printf("Square root of %lf is: %.0lf \n",a,floor(sqrt(a)));
+    return 0;
+}