1
Hello, how do I use the function rand() with the range Y [11, height+9] and X [11, width-1].
srand (time(NULL));
y=rand() % ((altura+9)-11) + 11;
x=rand() % ((largura-1)-11) + 11;
gotoXY(x, y);
cout<<"o";
Is that how it is? It is happening that it is generating many repeated numbers, and the interval should be large
Fills only this space in a cycle for(;;) in half a minute, where width = 70 and height = 25:
One of the problems is to loop this code in case I take srand (time(NULL));
It can already generate numbers well, but if I close the program and open again will generate with the same pattern, what I did not want this
What is the maximum and minimum value of X and Y?
– Victor Stafusa
I want to generate 2 integers, a Y and a X. O Y I want the range to be [11 the height+9] O X I want it to be [ 11 the width-1] Width and height is incognita
– Fábio Morais
If this is the case, the formulas appear to be correct.
– Victor Stafusa
That @Andersoncarloswoss, I couldn’t write that way
– Fábio Morais
The problem is that it’s generating several equal numbers, it’s not taking the whole range
– Fábio Morais
It would be something like, y:
rand() % (altura + 9) + 11and x:rand() % (largura-1) + 11? fished from doc. I don’t understand the-11in your code– Tuxpilgrim
What is the value of
alturaandlargura? I imagine they’re small, given thegotoXY.– Victor Stafusa
How often do you run this? What kind of very repeated numbers are you having?
– Victor Stafusa
I already edited the post, with more information
– Fábio Morais
I already know the answer: You are running the
srand (time(NULL));within thefor (;;). This will make it regenerate the same values always until the clock changes. Move this statement to before thefor.– Victor Stafusa
Exactly @Victorstafusa, can you explain why this is happening? I would like to understand
– Fábio Morais
The
srandwill use the parameter to generate a sequence of numbers. The first call following therand()will get the first number of that sequence. The second subsequent call, the second number, etc. However, if you call thesrandagain, it will restart a new sequence. As the parameter you use insrandwill be the same, time it changes slowly, it will always restart in the same sequence and with that keep generating repeated X and Y values until the clock changes.– Victor Stafusa
@Thank you so much for your help. Thank you to everyone who helped!
– Fábio Morais