C Program to Generate Random Numbers

Submitted by Srikanth on Wednesday, 16 January 20088 Comments

This is a simple program to generate random numbers. This logic can be used to build a Lotto program or a program to pick Lucky number and so on. Here’s the program

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

int main(void)
{
int i;
time_t t;
srand((unsigned) time(&t));
printf(“Ten random numbers from 0 to 99\n\n”);
for(i=0; i<10;i++)
printf(“%d\n”,rand()%100);
}

OR

If it necessary to generate a number between 0 and (num-1) then this program meets the ideal solution

#include<stdio.h>

#include<stdlib.h>

#include<time.h>

/* prints a random number in the range 0 to 99 */

int main(void)

{

randomize();

printf(“Random number in the 0-99 range: %d\n”, random (100));

return 0;

}

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8 Comments »

bumfluf said:

Thats great! I’ve been looking all over for this solution, thanks!

- 1 October 2008 at 3:30 PM

Anonymous said:

More of a question to anyone, Is their a program to figure out what random number algorithm (prng)a computer is useing to generate random numbers.

- 24 October 2008 at 11:38 PM

aditya said:

hai sir,

could u please explain the working of function srand();

- 25 March 2009 at 7:45 PM

Srikanth (author) said:

@ aditya

Refer http://www.cprogramming.com/tutorial/random.html

- 29 March 2009 at 9:25 AM

aswin said:

hi sirkanth ,
well i am newbie in C programming , just 15 years old and i am very curious about learning C programming . I am attending a course form a private institution and there they are very slow with the portions . SO i am thiking studying of my own , but will i get the logics required if i am learning my own to prgram looking at books

- 27 April 2009 at 7:59 AM

Srikanth (author) said:

@ aswin

Studying on your own is the best way to learn.. In fact I learnt programming only through books and not from any other source..

- 29 April 2009 at 9:09 PM

Siddhant said:

I am totally new to C…can you help me with the code structure written above and what should I refer to learn C…
Please help me with it
And one more thing, from where shall I download the program C?
Awaiting Response
My email ID is “siddhant_shah@live.com”
Thanks

- 11 November 2009 at 4:22 PM

someone said:

this is another way to do it

#include
using namespace std;
#include
#include

int main ()
{

int number;
//seeds the random number
srand(time(0));

//generates a # from 1 to 100
number = (rand()%100)+1;

//prints to screen
cout << random;

}

- 26 October 2011 at 4:08 AM

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