C :

#include <stdio.h>
int main(void)
{
	int a;
	scanf("%d",&a);
	switch (a)
	{
		case 1:
			printf("January");
			break;
		case 2:
			printf("February");
			break;
		case 3:
			printf("March");
			break;
		case 4:
			printf("April");
			break;
		case 5:
			printf("May");
			break;
		case 6:
			printf("June");
			break;
		case 7:
			printf("July");
			break;
		case 8:
			printf("August");
			break;
		case 9:
			printf("September");
			break;
		case 10:
			printf("October");
			break;
		case 11:
			printf("November");
			break;
		case 12:
			printf("December");
			break;
	}
	return 0;
}

C++ :

#include<iostream>
using namespace std;
int main()
{
	char *a[]={"January","February","March","April","May","June","July",
				"August","September","October","November","December"};
	int n;
	cin>>n;
	cout<<*(a+n-1)<<endl;
	return 0;
}