C Tutorial/math.h/log1p
log1p
Item Value Header file math.h Declaration float log1pf(float num);double log1p(double num);long double log1pl(long double num); Return returns the natural logarithm for num+1.
#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;
}