i need a random number between 1 to 100 for a number game im making

[empty willow]

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
int main(int argc, const char * argv[]) {
// insert code here...

int x = (rand() % 100)+1;
int y;
int loop=0;
while(loop<1){
    cin>>y;
    if(y==x){
        cout<<"You win!"<<endl;
        loop=1;
    }
    else if (y>x){
        cout<< "Lower"<<endl;
    }
    else if (y<x){
        cout<< "Higher"<<endl;
    }

}
return 0;

}

[waxen monolith]

When your question is answered use !solved to mark the question as resolved.

Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question use !howto ask.

[rich vault]

And whats the question?

[burnt spear]

!f

[waxen monolith]

Internal error while running !f

cppreference.com

rand

int rand();

Defined in

<stdlib.h>

[empty willow]

sry i wasnt looking at this all

it always uses the same number

[burnt spear]

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

int main(){
  srand(time(nullptr));
  for(int i = 0; i < 10; i++){
    std::cout << rand() << std::endl;
  }
  return 0;
}

[burnt spear]

;compile

[violet glacier]

Program Output

1245829513
474198281
1790316611
1125780126
660404363
1497842835
579698543
2145063111
522740060
1921903428

nevemlaci | 68ms | c++ | x86-64 gcc 14.1 | godbolt.org

[burnt spear]

¯_(ツ)_/¯

[empty willow]

if you dont mind can you please explain this

i just started learning c++ like a month ago

[burnt spear]

you need to set the seed for the random number generator

[empty willow]

?

[burnt spear]

the current time is usually a good seed

[burnt spear]

srand(time(nullptr));

[empty willow]

what does the time have to do with anything?

[burnt spear]

you need a seed

for a pseudorandom number

a random number is just a seed number that has been modified by many operations

[empty willow]

ok so it gives of the illusion of being random while actually being based on the time?

[burnt spear]

and to get a fairly random seed to start off you get the time

[burnt spear]

no

i mean

kinda

you need a seed

[empty willow]

thanks

[burnt spear]

A pseudorandom sequence of numbers is one that appears to be statistically random, despite having been produced by a completely deterministic and repeatable process.

[empty willow]

ok

btw what does srand mean

[burnt spear]

seedrand (?)

idk ¯_(ツ)_/¯

[empty willow]

ok

[waxen monolith]

cppreference.com

srand

void srand(unsigned seed);

Defined in

<stdlib.h>

[empty willow]

did you tell it to do that?

[burnt spear]

yes

[empty willow]

i heard this is one of the hardest coding languages to learn

[empty willow]

and thats kind of funny to me because in need to learn this before I get to high school for robotics lol

[empty willow]

whats that

[burnt spear]

haskell

[empty willow]

a coding languages?

[burnt spear]

dont worry about it

[empty willow]

ok

well thanks for the help!

!solved

[waxen monolith]

Thank you and let us know if you have any more questions!

This thread is now set to auto-hide after an hour of inactivity

[burnt spear]

btw

there is a whole random generator library for c++, but imo it's fairly complicated to justify using it for something simple

but it can do stuff like normal distribution for example

[rich vault]

The seed is needed to guarantee that the numbers are really random. Otherwise the numbers generated could repeat themselves. And this can be achieved by using time

[burnt spear]

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

int main(){
  srand(1U);
  for(int i = 0; i < 10; i++){
    std::cout << rand() << std::endl;
  }
  return 0;
}

[burnt spear]

;compile

[violet glacier]

Program Output

1804289383
846930886
1681692777
1714636915
1957747793
424238335
719885386
1649760492
596516649
1189641421

nevemlaci | 40ms | c++ | x86-64 gcc 14.1 | godbolt.org

[burnt spear]

@empty willow basically, if you'd use a constant value it'd give the same sequence

[empty willow]

ok

[burnt spear]

stuff like number of processes running, time, etc are almost never constant