How To Generate Random Number In Dev C++

  



To generate random numbers in C programming, use the function rand to generate and print random numbers. Random numbers without the pseudo. If you really need actual random numbers and are on a Linux or BSD-like operating system, you can use the special device files /dev/random and /dev/urandom. These can be opened for reading like ordinary files, but the values read from them are a random sequence of bytes (including null characters).

The example application uses rand to create the random value. When you take the modulus of the random number, you obtain an output that is within a specific range — 12 in this case. The example ends by adding 1 to the random number because there isn’t any month 0 in the calendar, and then outputs the month number for you. Enter a number: 6 Enter a number: 12 Enter a number: 7 Enter a number: 0 Enter a number: -2 The sum is 25. In this program, the user is prompted to enter a number, which is stored in the variable number. In order to store the sum of the numbers, we declare a variable sum and initialize it to the value of 0. One can define the function of their own way to estimate or generate the random number while there are inbuilt functions in any of the programming language that generates the random number. In the C programming language, we have a function called rand, which helps in generating the random number.

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.

C programming code using rand

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>
Generate#include <stdlib.h>

int main(){
int c, n;

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

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)

Generate Number

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>

How To Generate Random Number In Dev C Programming


Generate Random Number Java

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

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

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

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

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

How To Generate Random Number In Dev C++ Free

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

How To Generate Random Number In Dev C C++

getch();
return0;
}