rand - C stdlib.h

C examples for stdlib.h:rand

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Type

function

From 


<cstdlib>
<stdlib.h>

Description

Generate random number in the range between 0 and RAND_MAX.

Prototype 

int rand (void);

The following code shows how to create random number in a certain range.

v1 = rand() % 100;         // v1 in the range 0 to 99
v2 = rand() % 100 + 1;     // v2 in the range 1 to 100
v3 = rand() % 30 + 1985;   // v3 in the range 1985-2014

Parameters

none

Return Value

An integer value between 0 and RAND_MAX.

Demo Code


#pragma warning(disable:4996)//from  www  . j  a v a2s  . co m
#define _CRT_SECURE_NO_WARNINGS

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

int main()
{
  int iSecret, iGuess;


  /* generate secret number between 1 and 10: */
  iSecret = rand() % 10 + 1;

  do {
    printf("Guess the number (1 to 10): ");

    scanf("%d", &iGuess);

    if (iSecret<iGuess)
      puts("The secret number is lower");
    else if (iSecret>iGuess)
      puts("The secret number is higher");

  } while (iSecret != iGuess);


  return 0;
}

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