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.
<source lang="cpp">#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; }</source>