Lab 2

factorial.cpp

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+#include "functions.h"
+#include <bits/stdc++.h>
+using namespace std;
+int factorial(int n){
+    if(n < 0)
+    {   // Added changes for negative numbers
+        cout<<"Enter a positive no. as an input \n";
+        return -1;
+    }
+    else if(n!=1){
+	return(n * factorial(n-1));
+    }
+    else return 1;
+}
+// Vishwas Made a change

functions.h

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+void print_hello();
+int factorial(int n);
+int gcd(int a, int b);

gcd.cpp

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+#include <bits/stdc++.h>
+using namespace std;
+int gcd(int a, int b)
+{
+	if(!a) return b;
+	return gcd(b % a, a);
+}

hello.cpp

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+#include <iostream>
+#include "functions.h"
+using namespace std;
+void print_hello(){
+   printf("Hello World!");
+}

main.cpp

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+#include <iostream>
+#include "functions.h"
+using namespace std;
+int main(){
+    print_hello();
+    int x = 56 , y = 98;
+    cout<<gcd(x,y)<<"\n";
+    cout<<"\n";
+    cout<<"The factorial of 5 is "<<factorial(5)<<"\n";
+    return 0;
+}