Материал из C\C++ эксперт
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lround: returns the value of arg rounded to the nearest long integer
//Declaration: long int lroundf(float arg);
long int lround(double arg);
long int lroundl(long double arg);
// Values precisely between two values, such as 3.5, are rounded up.</p>
#include <math.h>
#include <stdio.h>
int main(void)
{
double val = 1.0;
do {
printf("%f %f\n", val, lround (val));
val++;
} while (val<11.0);
return 0;
}
/*
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6.000000 81386476629122498000000000000000000000000000000000000000000000000000000
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00000000000000000000000000000000000000.000000
7.000000 81386476629122513000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000.000000
8.000000 81386476629122528000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000.000000
9.000000 81386476629122542000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000.000000
10.000000 8138647662912255700000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000000.000000
*/
