log: returns the natural logarithm for num : log « math.h « C / ANSI-C

1. C / ANSI-C
2. math.h
3. log

log: returns the natural logarithm for num

    

//Header file:     #include <math.h>  
//Declaration:     float logf(float num); 
                   double log(double num); 
                   long double logl(long double 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
*/ 

           
       

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