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Log1p

Item Value Header filemath.h Declarationfloat log1pf(float num);double log1p(double num);long double log1pl(long double num); Returnreturns 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;   } 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