added bit header file in code

CPP_Programming/CheckPrime.cpp

@@ -2,17 +2,22 @@
 
 #include<iostream>
 using namespace std;
-
+int prime(int n)
+{
+    int flag=0;
+    for (int i=2; i<=n/2; i++) {
+		if (n%i==0)
+			flag=1;
+	}
+	return flag;
+}
 int main()
 {
-	int n,i,flag=0;
+	int n,ans=0;
 	cout<<"Enter any number: ";
 	cin>>n;
-	for (i=2; i<=n/2; i++) {
-		if (n%i==0) 
-			flag=1;
-	}
-	if (flag==0)
+
+	if (prime(n))
 		cout<<n<<" is a prime number.";
 	else
 		cout<<n<<" is a composite number.";

CPP_Programming/HCF.CPP

@@ -3,14 +3,15 @@
 	Author: Eshaan Bansal
 	Date: 23/09/2016 */
 
-#include<iostream.h>
+#include<bits/stdc++.h>
+using namespace std;
 #include<conio.h>
 
-void main() {
+int main() {
+
 
-	clrscr();
 	int a,b,N,D,R=1,HCF;
-	cout<<"\nEnter 2 numbers: ";
+	cout<<"Enter 2 numbers: "<<endl;
 	cin>>a>>b;
 	if (a>b) {
 		N=a;
@@ -31,5 +32,5 @@ void main() {
 		}
 	}
 	cout<<"HCF of "<<a<<" and "<<b<<" is: "<<HCF;
-	getch();
-}
+
+}