function 1-1
// function to return sum of elements in array
int sum_array(int array[], int n)
{
	int sum=0;

	for(int i=0; i<n; i++){
		if(n>0)
			sum = sum + array[i];
		else sum = 0;
	}
	return sum;
}

main-1-1
#include <iostream>
#include <stdlib.h>

extern int sum_array(int*, int);

int main(int argc,char **argv)
{
	int array[5] = {1,2,3,4,5};
	std::cout << "Array sum is: " << sum_array(array, 5) << std::endl;
	return 0 ;
}



function 1-2
// function to return average of elements in an array
double average(int array[], int n)
{
	double average = 0;
	double sum = 0;

	for(int i=0; i<n; i++){
			sum = sum + array[i];
	}
	if (n>0)
		average = sum/n;
	else average = 0;
	return average;
}

main 1-2
#include <iostream>
#include <stdlib.h>

extern double average(int*,int);

int main(int argc,char **argv)
{
	int array[3] = {1,2,3};
	std::cout << "Average is: " << average(array, 3) << std::endl;

}


function 1-3
// function to return number of elements that equal given parameter
int count(int array[], int n, int num)
{
	int equal = 0;

	for(int i=0; i<n; i++){
		if(array[i]==num)
			equal++;
	}
	return equal;
}

main 1-3
#include <iostream>
#include <stdlib.h>

extern int count(int*,int,int);

int main(int argc,char **argv)
{
	int array[5] = {2,2,3,3,5};
	std::cout << "Number equal is: " << count(array, 5, 3) << std::endl;
	return 0 ;
}



funciton 1-5
// function to count number of even numbers between 1 and given number
int count_even(int number)
{
	int count = 0;
	for (int i=1; i<=number; i++){
		if(i%2==0)
			count++;
	}
	return count;
}

main 1-5
#include <iostream>
#include <stdlib.h>

extern int count_even(int);

int main(int argc,char **argv)
{
	int number = 10;
	std::cout << "Number of evens is: " << count_even(number) << std::endl;
	return 0 ;
}

function 2-1
// function to return smallest number in an array
int minimum(int array[], int n)
{
	int min = array[0];
	for(int i=0; i<n; i++){
		if(array[i] < min)
			min = array[i];
	}
	return min;
}

main 2-1
#include <iostream>
#include <stdlib.h>

extern int minimum(int*,int);

int main(int argc,char **argv)
{
	int array[] = {1,2,3,4,5};
	std::cout << "The minimum is: " << minimum(array, 5) << std::endl;
	return 0 ;
}


function 2-2
// function to return maximum element in array
int maximum(int array[], int n)
{
	int max = array[0];
	for(int i=0; i<n; i++){
		if(max < array[i])
			max = array[i];
	}
	return max;
}

main 2-2
#include <iostream>
#include <stdlib.h>

extern int maximum(int*,int);

int main(int argc,char **argv){

	int array[5] = {1,2,3,4,5};
	std::cout << "The max is: " << maximum(array, 5) << std::endl;
	return 0;
}

function 2-4
//  function to determine if array is in ascending order
bool ascending(int array[], int n)
{
	for(int i=0; i<n; i++){
		if(array[i] > array[i+1])
			return false;
	}
	return true;

main 2-4
#include <iostream>
#include <stdlib.h>

extern bool ascending(int*,int);

int main(int argc,char **argv)
{
	int array[5] = {1,2,3,4,5};
	std::cout << "Array is ascending: " << ascending(array, 5) << std::endl;
	return 0;
}

function 2-5
// function to determine if elements in array are descending
bool descending(int array[], int n)
{
	for(int i=0; i<n-1; i++){
		if(array[i] < array[i+1])
			return false;
	}
	return true;
}

main 2-5
#include <iostream>
#include <stdlib.h>

extern bool descending(int*,int);

int main(int argc,char **argv)
{
	int array[5] = {1,2,3,4,5};
	std::cout << "Array is descending: " << descending(array, 5) << std::endl;
	return 0;
}