Pseudo Randon Number Generator code??

Hi,

I'm trying to use a simple PRNG C program but am having problems.

Could someone please run this code and let me know if it works and post the output. It should be working perfectly but I am having trouble with my compiler. Thanks

Code:

#include<stdio.h>
#include<stdint.h>

uint16_t rand16();
uint32_t rand32();

uint16_t n, userChosenValue = 0; //Change this for different seed values.
uint16_t numberOfValues = 10; //Change this depending on your needs.
uint32_t seed;
uint32_t mlcg,p,q;
uint64_t tmpseed;

int main(){
  
  /* Calculate and print a series of 16 bit random numbers */
  seed = (uint32_t)(userChosenValue + 1); 
  
  printf("16 Bit:\n\n");
  for (n=0;n<numberOfValues;n++){
    printf("%.4x\n",rand16());
  }
  
  /* Calculate and print a series of 32 bit random numbers */
  seed = (uint32_t)(userChosenValue + 1); 
  
  printf("\n\n32 Bit:\n\n");
  for (n=0;n<numberOfValues;n++){
    printf("%.8x\t\t\n",rand32());
  }
    
  return 0;
}

/* Return the next 32 bit random number */
uint32_t rand32() {
    
  tmpseed =  (uint64_t)33614U * (uint64_t)seed;
  q = tmpseed;     /* low */
  q = q >> 1;
  p = tmpseed >> 32 ;        /* hi */
  mlcg = p + q;
  if (mlcg & 0x80000000) { 
    mlcg = mlcg & 0x7FFFFFFF;
    mlcg++;
  }
  seed = mlcg;
  
  return mlcg; 
}

/* Return low 16 bits of next 32 bit random number */
uint16_t rand16() {
  return (uint16_t)rand32();
} 

Author: HUGHM
Newbie

Posts: 6
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