Thread: Random number generator

so, for this assignment they introduce the rand() function and also(finally) other libraries to use. anyway, the first program is as follows:

Write a program that will print out 10 random integers between 10 and 25. Prompt the user to enter the seed from which the random sequence will grow.

i used an example out of my text, but naturally it didn't work. i also asked my t.a.'s about it and they didn't know how to do it either. this left me thrilled. anyway, i was wondering what anybody thought of this.

Code:

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

int main()
{

   int x, i,z;

   printf("Enter a number between 10 & 25.\n");
   scanf("%d", x);

   printf("10 random numbers between values are as follows:\n");

   for(i=0; i<10; i++)
   {
      z=10 + (srand(x) % 25);
      printf("%d\n", z);
   }
   
   return 0;
}

cool, i got it. thanks.

Code:

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

int main()
{
   int seed, i,z;
   
   printf("RAND_MAX = %d\n", RAND_MAX);
	
   printf("Enter seed:");
   scanf("%d", &seed);
	 
   srand(seed);

   printf("10 random number between values are as follows:\n");

   for(i=0; i<10; i++)
   {
      z=10 + (rand() % 16);
      printf("%d\n", z);
   }
   
   return 0;
}

Put srand up above the for loop.

Add the ampersand '&' in front of x in the scanf() line of code.

Since rand() % N, will give you 0 to N-1 in range, you need to add ten and mod '%' 25 in your rand() line of code.

For example, if I wanted to get a range of 1 to 6, I'd use: rand() % 6 + 1. (rand % 6 by itself, would give me numbers ranging from 0 to 5).