SEI CERT C Coding Standard

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Code Block
bgColor#ccccff
langc
#ifndef _CRT_RAND_S
#define _CRT_RAND_S 1
#endif
#include <stdio.h>
#include <stdlib.h>
 
int func(void) {
  unsigned int number;
  errno_t err;

  err = rand_s( &number);
  if (err != 0) {
    /* handle error */
  } else {
    printf("Random number: %u\n", number);
  }
}

Risk Assessment

The use of the rand() function can result in predictable random numbers.

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