rand() c++

/* rand example: guess the number */
#include <stdio.h>      /* printf, scanf, puts, NULL */
#include <stdlib.h>     /* srand, rand */
#include <time.h>       /* time */

int main ()
{
  int iSecret, iGuess;

  /* initialize random seed: */
  srand (time(NULL));

  /* 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);

  puts ("Congratulations!");
  return 0;
}

4
6

                                    std::srand(std::time(nullptr)); 		// set rand seed
v1 = std::rand() % 100;         // v1 in the range 0 to 99
v2 = std::rand() % 100 + 1;     // v2 in the range 1 to 100
v3 = std::rand() % 30 + 1985;   // v3 in the range 1985-2014 

4 (6 Votes)
0
3.89
9
Felix Jen 95 points

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

3.89 (9 Votes)
0
3.5
2
Ian Barnett 100 points

                                    #include &lt;cstdlib&gt;
#include &lt;iostream&gt;
#include &lt;ctime&gt;
&nbsp;
int main() 
{
    std::srand(std::time(nullptr)); // use current time as seed for random generator
    int random_variable = std::rand();
    std::cout &lt;&lt; &quot;Random value on [0 &quot; &lt;&lt; RAND_MAX &lt;&lt; &quot;]: &quot; 
              &lt;&lt; random_variable &lt;&lt; '\n';
}

3.5 (2 Votes)
0
3.67
6
JIlly 110 points

                                    #include &lt;cstdlib&gt;
#include &lt;iostream&gt;
#include &lt;ctime&gt;
&nbsp;
int main() 
{
    std::srand(std::time(nullptr)); // use current time as seed for random generator
    int random_variable = std::rand();
    std::cout &lt;&lt; &quot;Random value on [0 &quot; &lt;&lt; RAND_MAX &lt;&lt; &quot;]: &quot; 
              &lt;&lt; random_variable &lt;&lt; '\n';
&nbsp;
    // roll 6-sided dice 20 times
    for (int n=0; n != 20; ++n) {
        int x = 7;
        while(x &gt; 6) 
            x = 1 + std::rand()/((RAND_MAX + 1u)/6);  // Note: 1+rand()%6 is biased
        std::cout &lt;&lt; x &lt;&lt; ' ';
    }
}

3.67 (6 Votes)
0
3.57
7
Fukuan 70 points

                                    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 

3.57 (7 Votes)
0
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