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#include <iostream> | |
using namespace std; | |
// rounds a float or double away from zero, casting to an integer type has to be applied | |
#define UTIL_ROUND(v) ((v) < 0 ? ((v) - 0.5f) : ((v) + 0.5f)) | |
int main() | |
{ | |
for (float f = -3.1f; f < 3.1f; f += 0.1f) | |
{ | |
cout << f << " => " << (int)UTIL_ROUND(f) << endl; | |
} | |
} | |
/* output: | |
-3.1 => -3 | |
-3 => -3 | |
-2.9 => -3 | |
-2.8 => -3 | |
-2.7 => -3 | |
-2.6 => -3 | |
-2.5 => -3 | |
-2.4 => -2 | |
-2.3 => -2 | |
-2.2 => -2 | |
-2.1 => -2 | |
-2 => -2 | |
-1.9 => -2 | |
-1.8 => -2 | |
-1.7 => -2 | |
-1.6 => -2 | |
-1.5 => -2 | |
-1.4 => -1 | |
-1.3 => -1 | |
-1.2 => -1 | |
-1.1 => -1 | |
-1 => -1 | |
-0.900001 => -1 | |
-0.800001 => -1 | |
-0.700001 => -1 | |
-0.600001 => -1 | |
-0.500001 => -1 | |
-0.400001 => 0 | |
-0.300001 => 0 | |
-0.200001 => 0 | |
-0.100001 => 0 | |
-6.10948e-07 => 0 | |
0.0999994 => 0 | |
0.199999 => 0 | |
0.299999 => 0 | |
0.399999 => 0 | |
0.499999 => 0 | |
0.599999 => 1 | |
0.699999 => 1 | |
0.799999 => 1 | |
0.899999 => 1 | |
0.999999 => 1 | |
1.1 => 1 | |
1.2 => 1 | |
1.3 => 1 | |
1.4 => 1 | |
1.5 => 1 | |
1.6 => 2 | |
1.7 => 2 | |
1.8 => 2 | |
1.9 => 2 | |
2 => 2 | |
2.1 => 2 | |
2.2 => 2 | |
2.3 => 2 | |
2.4 => 2 | |
2.5 => 2 | |
2.6 => 3 | |
2.7 => 3 | |
2.8 => 3 | |
2.9 => 3 | |
3 => 3 | |
3.1 => 3 | |
*/ |
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