Difference between revisions of "CPP/RandomNumbers"
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Daviddoria (Talk | contribs) (Created page with '==RandomNumbers.cpp== <source lang="cpp"> #include <iostream> #include <cstdlib> //drand48() #include <cstdio> #include <ctime> using namespace std; void RandomInts(); void Ran…') |
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cout << t << endl; | cout << t << endl; | ||
srand(t); | srand(t); | ||
+ | srand48(t); | ||
//RandomFloats(); | //RandomFloats(); |
Latest revision as of 11:06, 30 July 2012
RandomNumbers.cpp
#include <iostream> #include <cstdlib> //drand48() #include <cstdio> #include <ctime> using namespace std; void RandomInts(); void RandomDoubles(); void RandomFloats(); int RandomInt(const int MAX); double RandomDouble(); float RandomFloat(); int main() { unsigned int t = time(NULL); cout << t << endl; srand(t); srand48(t); //RandomFloats(); RandomDoubles(); //RandomInts(); return 0; } void RandomInts() { //srand((unsigned)time(0)); //if you dont do this, they are the same every time int random_integer; int n = 10; int MAX = 5; for(int index = 0; index < n; index++) { random_integer = RandomInt(MAX); cout << random_integer << endl; } } void RandomDoubles() { //srand48((unsigned)time(0)); //if you dont do this, they are the same every time int n = 10; //produce n random doubles between 0 and 1 for(int i = 0; i < n; i++) { double r = RandomDouble(); cout << r << endl; } } void RandomFloats() { //srand48((unsigned)time(0)); //if you dont do this, they are the same every time int n = 10; //produce n random doubles between 0 and 1 for(int i = 0; i < n; i++) { float r = RandomFloat(); cout << r << endl; } } double RandomDouble() { //produce a random double between 0 and 1 return drand48(); } float RandomFloat() { //produce a random float between 0 and 1 return drand48(); } int RandomInt(const int MAX) { //produce an int from 0 to MAX-1 return rand() % MAX; }