added files to mathematics folder in cpp

Author: himanshi2608

Mathematics/GCD/LcmAndGcd.cpp

@@ -0,0 +1,15 @@
+#include <iostream> 
+using namespace std;
+
+int main(){
+int a,b,result;
+cout<<"Enter two numbers = ";
+cin>>a>>b;
+#using stl for finding gcd of 2 numbers..
+result=__gcd(a,b);
+cout<<"GCD is= "<<result;
+cout<<"LCM is="<<(a*b)/result;
+
+}
+return 0;
+}

Mathematics/fibonacci/fibonacci(iterative).cpp

@@ -0,0 +1,24 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main()
+{
+ int t1 = 0, t2 = 1, nextTerm = 0, n;
+
+ cout << "Enter a positive number: ";
+ cin >> n;
+
+ // displays the first two terms which is always 0 and 1
+ cout << "Fibonacci Series: " << t1 << ", " << t2 << ", ";
+
+ nextTerm = t1 + t2;
+
+ while(nextTerm <= n)
+ {
+ cout << nextTerm << ", ";
+ t1 = t2;
+ t2 = nextTerm;
+ nextTerm = t1 + t2;
+ }
+ return 0;
+}