| | | 19.47.1.log |
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| Item | Value | | Header file | math.h | | Declaration | float logf(float num);
double log(double num);
long double logl(long double num); | | Return | returns the natural logarithm for num. |
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#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;
}
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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 |
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