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 CodingForums.com Why is it always zero?

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 11-14-2011, 12:09 AM PM User | #1 HopefulCoder New to the CF scene   Join Date: Jul 2011 Posts: 8 Thanks: 4 Thanked 0 Times in 0 Posts Why is it always zero? This is going to be a fairly simple question, but why does this always spit out 0? Code: #include #include #include #include #include using namespace std; int roll; int dice(){ srand(time(NULL)); int roll=rand()%2+1; return roll; } int main(void){ char answer; cout<<"Flip coin? (y or n) "; cin>> answer; if(answer=='y'||answer=='Y'){ dice(); cout<
 11-14-2011, 02:00 AM PM User | #2 Spookster Supreme Overlord     Join Date: May 2002 Location: Marion, IA USA Posts: 6,264 Thanks: 4 Thanked 83 Times in 82 Posts Did you run it through a debugger? __________________ Spookster CodingForums Supreme Overlord All Hail Spookster
 11-14-2011, 03:07 AM PM User | #3 HopefulCoder New to the CF scene   Join Date: Jul 2011 Posts: 8 Thanks: 4 Thanked 0 Times in 0 Posts Yes, no problems there. The program runs, but always spits out zero if y or Y is picked. Which I'm guessing means there is something wrong with the random number generator.
 11-14-2011, 04:39 AM PM User | #4 oracleguy Rockstar Coder   Join Date: Jun 2002 Location: USA Posts: 9,054 Thanks: 1 Thanked 322 Times in 318 Posts You don't need to seed the RNG every time you call your dice function. You only need to do it once in your main function. The reason it is always zero though is because you are printing the value of the global variable 'roll' which you are never initializing. (The debugger is just being nice enough to zero it for you.) And you never assign the return value of your dice function to said roll variable. Or you could just cout the result of the function if you wanted. __________________ OracleGuy
 Users who have thanked oracleguy for this post: HopefulCoder (11-14-2011)

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