/*
Tara
Jan 17th 2017
Lab 1
*/

#include <stdio.h>
#include <stdbool.h>

int summation();
int choice;

int main()
{
	int num;
	printf("***Choose a function to use!***\n Enter 1 for summation\n Enter 2 for factorial\n Enter 3 for fibonacci\n Enter 4 for greatest common denominator\n Enter 5 for a power function: ");
	scanf("%d", choice);
	if (choice == 1){
		summation();

	}
	return 0;
}

int summation()
{
	bool validNum = false;
	int num = 0, i, sum=0;

	while (!validNum){

		printf("Enter a number (>= 1): ");
		scanf("%d", &num);

		if (num <= 0){
			printf("Invalid Number.\n");
		}
		else if (num>0){
			validNum = true;

		}
	}

	for(i=0; i <= num; i++)
    {
        sum += i;
    }
	return 0;

}