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#include <stdio.h>
#include <stdlib.h>

#define  MAXSIZE 15

int printMenu(int menu);
int divRoutine(int menu);
int arraySearch(int menu);

int main()
{
	int menu = 0;

	do
	{
		printMenu(menu);
	}
	while(menu != 3);

	system("pause");
	return 0;
}

int printMenu(int menu)
{
	int select = menu;
	
	printf("Sort Menu\n");
	printf("=========\n\n");
	printf("1> Divide\n");
	printf("2> Find parts of the array\n");
	printf("3> Exit\n");
	printf("==========================\n\n");
	printf("Please make a selection: ");
	scanf("%i", &select);

	switch (select)
	{
		case 1: 
			divRoutine(menu);
			break;
		case 2:
			arraySearch(menu);
			break;
		case 3:
			printf("\nThank you for time.\n\n");
			system("pause");
			exit(0);
		default:
			printf("Sorry, I did not understand your selection\n\n");
			printf("Goodbye!\n\n");
			system("pause");
			exit(0);
	}
}

int divRoutine(int menu)
{
	int select = menu;
	int num1 = 0, num2 = 0;
	float result = 0;

	printf("\n\nLets Divide Stuff!\n\n");
	printf("Enter the first number: ");
	scanf("%i", &num1);
	printf("\n%i divided by what? ", num1);
	scanf("%i", &num2);

	if(num2 == 0)
	{
		printf("Sorry, we cant not divide by zero!\n\n");
	}
	else
	{
		printf("\n%i divided by %i is %.2g\n\n", num1, num2, result = (float)num1 / (float)num2);
	}
	system("pause");
	system("cls");
	return select;
}

int arraySearch(int menu)
{
	int select = menu, i = 0, size = 0, j = 0, temp = 0, sizeCheck = 0, process = 1;
	// int a[MAXSIZE] = {75, 27, 19, 34, 6};  Testing Array
	int a[MAXSIZE] = {0};

	printf("\n\nLets Do Array Stuff\n\n");

	do
	{
		printf("Pick an odd number of elements you want in the array (MAX %i): ", MAXSIZE);
		scanf("%i", &size);
		sizeCheck = size % 2;

		if (size > MAXSIZE || sizeCheck == 0)
		{
			printf("\nWe need an odd number of elements with a MAX number of %i!\n\n", MAXSIZE);
			system("pause");
			system("cls");
			process = 0;
		}
		else
		{
			process = 1;
		}

	}while(process == 0);

	printf("\n");

	for(i = 0; i < size; i++)
	{
		printf("Enter array element %i: ", i + 1);
		scanf("%i", &a[i]);
	}

	printf("\nHere is the array we are starting with: ");
	for(i = 0; i < size; i++)
	{
		printf("%i ", a[i]);
	}
	printf("\n\n\n");

	for(i = 0; i < size; i++)
    {
	    for(j = 0; j < size-1; j++)
	    {
		    if(a[j] > a[j+1])
	        {
			    temp = a[j];
				a[j] = a[j+1];
	            a[j+1] = temp;
	        }
	    }
	 }

	printf("1> The smallest value is: %i \n", a[0]);
	printf("2> The middle value is: %i \n", a[size / 2]);
	printf("3> The largest value is: %i \n", a[size - 1]);

	printf("\n");

	system("pause");
	system("cls");
	return select;
}

This was an exercise to call functions, pass variables and return a value. A little user input error checking is included.

#include <stdio.h>
#include <stdlib.h>

#define SIZE 4

void getInput(int num[]);
int getLargest(int num[], int size);

int main()
{
		int i, largest, num[SIZE];

		getInput(num);
		getLargest(num, SIZE);

		printf("The largest number is: %i. \n", getLargest(num, SIZE));

		system("pause");
		return 0;
}

void getInput(int num[])
{
	int i;

	for (i = 0; i < SIZE; i++)
		{
			printf("Enter a unique integer: ");
			scanf("%i", & num[i]);
		}
}

int getLargest(int num[], int size)
{
	int i, largest;

	for (i = 0, largest = num[i++]; i < SIZE; i++)
		{
			if (num[i] > largest)
			{
				largest = num[i];
			}
		}
	return largest;
}

Takes input from user, then gives back the largest number from input. Array size can easily be changed through the constant SIZE. Notice the functions at the bottom. 🙂

I wrote a short lottery number generator. It accepts two inputs from the user:

1> How many numbers?
2> Range of numbers?

It then checks to see if the user input is valid then loops through a for loop to generate X numbers.