Mega Code Archive

 

Categories / C Tutorial / Math h

 

Log

Item Value Header filemath.h Declarationfloat logf(float num);double log(double num);long double logl(long double num); Returnreturns the natural logarithm for num. #include <math.h>   #include <stdio.h>   int main(void)   {     double val = 1.0;     do {       printf("%f %f\n", val, log(val));       val++;     } while (val<11.0);     return 0;   } 1.000000 0.000000 2.000000 0.693147 3.000000 1.098612 4.000000 1.386294 5.000000 1.609438 6.000000 1.791759 7.000000 1.945910 8.000000 2.079442 9.000000 2.197225 10.000000 2.302585