I don't know what I'm doing.

[ickthorne]

Hi everyone,

I’m new to this programming world so I’m sorry if I’m asking a stupid question. I have a problem trying to get a variable output from a random number generator input. What I’m trying to do is take the output from the number generator and have that determine the out come. My number generator goes from 1-12, what I want it to do is have the output vary so that if an output is between 1-4 it says no, and if it is between 5-8 it say maybe, and 9-12 is yes. I got the number generator working fine, but I can’t get the code right to make it determine the proper outputs. Is there a special magic word I should be using? My “if” statements always come back with errors that I don’t know how to fix. I’m sure I’m trying to do something that is way beyond my knowledge level and I shouldn’t even be trying this, but I want to learn as much as possible.

[Bazzy]

- I don't know how your RNG works so I assume it gives you integer values -

// assume 'x' holds the random value: 
if ( x < 5 ) // x in [1,4]
   cout << "No";
else if ( x < 9 ) // x in [5,8]
   cout << "Maybe";
else
   cout << "Yep";

If you post your code we can tell you what you are doing wrong

[ickthorne]

Sorry I should have added it before.

#include <cstdlib>
#include <ctime>
#include <iostream>

using namespace std;

int main()
{
srand(time(NULL));

int random_integer;
for(int index = 0; index < 1; index++){
random_integer = (rand() % 12)+1;
cout << random_integer << endl;
}

int random_integer;
Var yes, no ,maybe;

if (random_integer <= 4){
cout << "No\n";
}
Else if (random_integer <= 8) {
cout << "maybe \n";
}
Else if (random_integer <=12) {
cout << "yes \n";
}
}

[Bazzy]

C++ is case sensitive, replace 'Else' with 'else'

The line Var yes, no ,maybe; does nothing and 'Var' is not a standard type

[ickthorne]

That was my problem. I changed the else and everthing is fine. I've also stripped the line var from my code. Thank you very much. If you don't mind me asking, but what would I need to add if I wanted to have the generator produce multiple outputs and give me the responce to all of those outputs? i.e. 12,2,6,9,1.....yes,no,maybe,yes,no

[firedraco]

Use a while loop around the code you want to repeat:

http://www.cplusplus.com/doc/tutorial/control/#while

[Bazzy]

You may also need to store the numbers in a container: http://www.cplusplus.com/reference/stl/deque/begin/

[ickthorne]

You've all given me great advise, thank you soo much. I'll begin studing these now.

[ickthorne]

OK, I'm going crazy! I've tried this with the while loop (which causes the whole thing to blow up). All I want is for it to give me the answer for each output.

#include <cstdlib>
#include <ctime>
#include <iostream>

using namespace std;

int main()
{


srand(time(NULL));

int random_integer;
for(int index = 0; index < 11; index++){
random_integer = (rand() % 12)+1;
cout << random_integer << endl;
}
if (random_integer < 5){
cout << "no\n";
}
else if (random_integer < 9) {
cout << "Maybe \n";
}
else
cout << "yes \n";
}

what I get is 11 variable numbers and the answer (yes, no, or maybe) for the last output. Shouldn't it tell me what each of the 11 outputs are? what am I missing?

[iw0XoG1T]

#include <cstdlib>
#include <ctime>
#include <iostream>

using namespace std;

int main(){

	srand(time(NULL));

	int random_integer;

	for(int index = 0; index < 11; index++){

		random_integer = (rand() % 12)+1;
		cout << random_integer << ' ';
	
		if (random_integer < 5)cout << "no \n";

		if (random_integer >= 5 && random_integer< 9)cout << "Maybe \n";

		if (random_integer >= 9)cout << "yes \n";
	}
}

[ickthorne]

Wow! that worked great. What was I doing wrong?

[gcampton]

very easy to create a RNG function or 2, setter and getter I include both in 1 function.

int randomNumGen(int numOutOf)
{
     return 1 + rand() % numOutOf;
}

int main()
{
     srand(time(NULL));
     int num1=randomNumGen(12);
     int num2=randomNumGen(192382);

....  etc etc etc   ....

or you if you don't want to set on each call then:

void setRandNum(int numOutOf)
{
     randNum=numOutOf;
}

int getRandNum()
{
     return 1+rand()%randNum;
}