This generates a random float between two floats.
float RandomFloat(float min, float max){
return ((max - min) * ((float)rand() / RAND_MAX)) + min;
}
while it might not matter now here is a function which generate a float between 2 values.
#include <math.h>
float func_Uniform(float left, float right) {
float randomNumber = sin(rand() * rand());
return left + (right - left) * fabs(randomNumber);
}
You can also generate in a range [min, max] with something like
float float_rand( float min, float max )
{
float scale = rand() / (float) RAND_MAX; /* [0, 1.0] */
return min + scale * ( max - min ); /* [min, max] */
}
If you want to generate a random float in a range, try a next solution.
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
float
random_float(const float min, const float max)
{
if (max == min) return min;
else if (min < max) return (max - min) * ((float)rand() / RAND_MAX) + min;
// return 0 if min > max
return 0;
}
int
main (const int argc, const char *argv[])
{
srand(time(NULL));
char line[] = "-------------------------------------------";
float data[10][2] = {
{-10, 10},
{-5., 5},
{-1, 1},
{-0.25, -0.15},
{1.5, 1.52},
{-1700, 8000},
{-0.1, 0.1},
{-1, 0},
{-1, -2},
{1.2, 1.1}
};
puts(line);
puts(" From | Result | To");
puts(line);
int i;
for (i = 0; i < 10; ++i) {
printf("%12f | %12f | %12f\n", data[i][0], random_float(data[i][0], data[i][1]), data[i][1]);
}
puts(line);
return 0;
}
A result (values is fickle)
-------------------------------------------
From | Result | To
-------------------------------------------
-10.000000 | 2.330828 | 10.000000
-5.000000 | -4.945523 | 5.000000
-1.000000 | 0.004242 | 1.000000
-0.250000 | -0.203197 | -0.150000
1.500000 | 1.513431 | 1.520000
-1700.000000 | 3292.941895 | 8000.000000
-0.100000 | -0.021541 | 0.100000
-1.000000 | -0.148299 | 0.000000
-1.000000 | 0.000000 | -2.000000
1.200000 | 0.000000 | 1.100000
-------------------------------------------
Source: Stackoverflow.com