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[DEV] add random set seek element

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This commit is contained in:
Edouard DUPIN 2014-02-19 21:08:55 +01:00
parent 7f26881c3e
commit 89d9bc87ad
2 changed files with 28 additions and 5 deletions
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15
etk/tool.cpp
View File

@ -14,13 +14,20 @@
#include <unistd.h>
#include <stdlib.h>
float etk::tool::frand(float _a, float _b)
double etk::tool::frand(double _a, double _b)
{
return ( rand()/(float)RAND_MAX ) * (_b-_a) + _a;
return (float)(( (double)rand()/(double)RAND_MAX ) * ((double)_b-(double)_a) + (double)_a);
}
int32_t etk::tool::irand(int32_t _a, int32_t _b)
{
return (int32_t)(( rand()/(float)RAND_MAX ) * ((float)_b-(float)_a) + (float)_a);
return (int32_t)(( rand()/(double)RAND_MAX ) * ((double)_b-(double)_a) + (double)_a);
}
void etk::tool::resetRandom(void) {
srand(time(NULL));
}
void etk::tool::randSeek(int32_t _val) {
srand(_val);
}

18
etk/tool.h
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@ -13,8 +13,24 @@
namespace etk {
namespace tool {
float frand(float _a, float _b);
/**
* @brief Get a random value in a specific range.
* @param[in] _a Lower value of the random.
* @param[in] _b Bigger value of the random.
* @return Random Value between [_a and _b]
*/
double frand(double _a, double _b);
//! @previous
int32_t irand(int32_t _a, int32_t _b);
/**
* @brief Reset the random system with a random value (time).
*/
void resetRandom(void);
/**
* @brief Reset the random system with The specify value.
* @param[in] _val Seek value for the pseudo random system.
*/
void randSeek(int32_t _val);
};
};