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Dev C++ Random Number Generator

 

C program to generate pseudo-random numbers using rand and random function (Turbo C compiler only). As the random numbers are generated by an algorithm used in a function they are pseudo-random, this is the reason that word pseudo is used. Function rand() returns a pseudo-random number between 0 and RAND_MAX. RAND_MAX is a constant which is platform dependent and equals the maximum value returned by rand function.

Specifically to OP's question: capture the random number generation logic in a reusable function that is parameterized by the range of numbers you wish to produce. In this example, you can pass any two non-negative integers to the function generateRandomNumberInRange and it will return a random number in that range. Mar 14, 2019  Let us see how to generate random numbers using C. Here we are generating a random number in range 0 to some value. (In this program the max value is 100).To.

Jul 10, 2012  Today I'll be showing you how to create your own random number generator in C. Visit my website at http://www.thekasattack.comyr.com. Apr 08, 2013  Specifically to OP's question: capture the random number generation logic in a reusable function that is parameterized by the range of numbers you wish to produce. In this example, you can pass any two non-negative integers to the function generateRandomNumberInRange and it will return a random number in that range. The character special files /dev/random and /dev/urandom (present since Linux 1.3.30) provide an interface to the kernel's random number generator. The file /dev/random has major device number 1 and minor device number 8. For repeat calls to seed the random number generator (in fact, it will make your number less evenly distributed). A commonly used technique is to seed the random number generator using the clock. The time function will return the computer’s time. On transformer, this is expressed in terms of the number of.

C programming code using rand

C++ random number generator function

We use modulus operator in our program. If you evaluate a % b where a and b are integers then result will always be less than b for any set of values of a and b. For example
For a = 1243 and b = 100
a % b = 1243 % 100 = 43
For a = 99 and b = 100
a % b = 99 % 100 = 99
For a = 1000 and b = 100
a % b = 1000 % 100 = 0

In our program we print pseudo random numbers in range [0, 100]. So we calculate rand() % 100 which will return a number in [0, 99] so we add 1 to get the desired range.

#include <stdio.h>
#include <stdlib.h>

int main(){
int c, n;

printf('Ten random numbers in [1,100]n');

Dev C++ Random Number Generator

for(c =1; c <=10; c++){
n =rand()%100+1;
printf('%dn', n);
}

return0;
}

If you rerun this program, you will get the same set of numbers. To get different numbers every time you can use: srand(unsigned int seed) function; here seed is an unsigned integer. So you will need a different value of seed every time you run the program for that you can use current time which will always be different so you will get a different set of numbers. By default, seed = 1 if you do not use srand function.

C programming code using random function (Turbo C compiler only)

Function randomize is used to initialize random number generator. If you don't use it, then you will get same random numbers each time you run the program.

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>

int main()
{
int n, max, num, c;

Dev C++ Random Number Generator

printf('Enter the number of random numbers you wantn');
scanf('%d',&n);

printf('Enter the maximum value of random numbern');
scanf('%d',&max);

C++ Random Number Generator Code

printf('%d random numbers from 0 to %d are:n', n, max);
randomize();

Random Number Generator In Dev C++

for(c =1; c <= n; c++)
{
num = random(max);
printf('%dn',num);
}

Dev C++ Random Number Generator Between Two Numbers

getch();
return0;
}