Develop a program that uses a randomly generated number to select 1 of 3 functions to show the user

[Respect]

#include "stdafx.h"


#include <iostream>
int main(){
	int a;
	a = (rand() % 3) + 1;
	std::cout << a;
	switch (a){
	case 1:int x;
		x = 1; {
			std::cout << "First";
		}break;
	case 2:int u;
		u = 2; {
			std::cout << "Second";
		}break;
	case 3:int z;
		z = 3; {
			std::cout << "Third";
		}
	}
}

Always shows Third case.Not random.Help!

[TarikNeaj]

You need to seed.

Add this - #include <time.h>
And put this at the top of your program - srand (time(NULL));

[Respect]

Thank you! But why is this step necessary, excuse my ignorance?

[TarikNeaj]

Read here - http://www.cplusplus.com/reference/cstdlib/srand/

If you want to do propar random generating, then you don't want to use rand() since it's pretty shittie - https://channel9.msdn.com/Events/GoingNative/2013/rand-Considered-Harmful

You instead want to use the header <random> - http://www.cplusplus.com/reference/random/

(There are examples all over the internet and in the video above)

[Respect]

Okay!Thanks!

[Psalazar2016]

Very good question! =) Although I do not have a perfect explanation to the why, other than telling you that rand()% will not actually give you a real random number. If you want a good explanation I suggest you google for your answer. as to the solution include the library <ctime> and add srand(time(NULL)); to reset the counter. It should give you different results every time you run your program. Hope you google for your explanation though. Good Luck.

[Psalazar2016]

Thanks TarikNeaj for the wonderful knowledge!