Материал из C\C++ эксперт
log1p: returns the natural logarithm for num+1
//Declaration: float log1pf(float num);
double log1p(double num);
long double log1pl(long double num);
#include <math.h>
#include <stdio.h>
int main(void)
{
double val = 1.0;
do {
printf("%f %f\n", val, log1p (val));
val++;
} while (val<11.0);
return 0;
}
/*
1.000000 0.693147
2.000000 1.098612
3.000000 1.386294
4.000000 1.609438
5.000000 1.791759
6.000000 1.945910
7.000000 2.079442
8.000000 2.197225
9.000000 2.302585
10.000000 2.397895
*/
