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
#include
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