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;
}
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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
Thank you!
6
4
(6 Votes)
0
3.89
9
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
Thank you!
9
3.89
(9 Votes)
0
3.5
2
#include <cstdlib>
#include <iostream>
#include <ctime>
int main()
{
std::srand(std::time(nullptr)); // use current time as seed for random generator
int random_variable = std::rand();
std::cout << "Random value on [0 " << RAND_MAX << "]: "
<< random_variable << '\n';
}
Thank you!
2
3.5
(2 Votes)
0
3.67
6
#include <cstdlib>
#include <iostream>
#include <ctime>
int main()
{
std::srand(std::time(nullptr)); // use current time as seed for random generator
int random_variable = std::rand();
std::cout << "Random value on [0 " << RAND_MAX << "]: "
<< random_variable << '\n';
// roll 6-sided dice 20 times
for (int n=0; n != 20; ++n) {
int x = 7;
while(x > 6)
x = 1 + std::rand()/((RAND_MAX + 1u)/6); // Note: 1+rand()%6 is biased
std::cout << x << ' ';
}
}
Thank you!
6
3.67
(6 Votes)
0
3.57
7
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
Thank you!
7
3.57
(7 Votes)
0
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