Question

I want a table of four values between 1 to 6.

I’m using: rand() % 6 + 1;

This should give values between 1 and 6.

Except if rand() generates the value 0.

1. I keep getting 7’s. I don’t want any 7’s

2. What is the range of rand? How I prevent it from generation any 0 values?

3. Alternative solutions are quite welcome.

4. My teacher gave us the clue of using “random”.
   We use Borland C++ Builder 5 at school.
   I am using Dev-C++ 5.3.0.3 at home.
   I find there are a few differences to how they work, which I find strange..
   I can’t use random(), it gives me not declared in scope…

   int main (){
   
       int I;
       int Fasit[3];
   
       srand (time(NULL) );
   
       for(I=0; I<4; I++) {
           Fasit[I]=rand() % 6 + 1;
       }
   
       std::cout << Fasit[0] << " " << Fasit[1] << " " << Fasit[2] << " " << Fasit[3] << " ";
   
       return 0;
   }
   

Some values I get:

2 6 1 7  
5 2 1 4  
5 2 1 4  
5 2 1 4  
1 3 1 6  
5 3 3 7  
5 3 3 7  
5 3 3 7

7 shouldn’t be possible, should it?

PS: I know my print is ham fisted, I will make it a bit more elegant once the number generation works.

Answer 1

Consdier these lines:

int Fasit[3];
for(I=0; I<4; I++) {
  Fasit[I]

You declare an array of three entries, which you write to four times.

Try your program again, but with:

int Fasit[4];