Question

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How to generate a random number from within a range – C

How would you generate a random number between 1 and N-1 where N is a number the user punches in?

So far, my code is:

#include <stdio.h>
#include <stdlib.h>
int main()
{
    int number = 0; //number variable
    printf("This program will ask you for a number, an integer, and will print out a    random number from the range of your number 1, to N-1.");//output that explains the program's purpose and use to the user.
    //gets the input
    fgets(buffer, sizeof(buffer), stdin);
    sscanf(buffer, "%d", &number); //gets the input and stores it into variable number

    return (0);

}

Answer 1

Try something like this:-

unsigned int
randomr(unsigned int min, unsigned int max)
{
       double x= (double)rand()/RAND_MAX;

       return (max - min +1)*x+ min;
}

Check out this link:- http://c-faq.com/lib/randrange.html