my_log.c

#include <stdio.h>
#include <math.h>


int main() {
    float x;
    int n;
    double sum = 0.0;    
    
/* Read a number from standard input. Execute the loop if it is successful. */
    /* To exit, press Ctrl-D or Ctr-C */
    while(scanf("%f %d", &x, &n) == 2)
    {
        
        for(int i=0; i<=n; i++)
        {
            
            if(i == 0){
                sum = 0.0;
            }
            
            if(i == 1) {
                sum += (double)x;
            }
            
            if(i>1){
                if(i % 2 == 1){
                    sum += (((double)pow(x,i))/(double)i);   
                
                }
                else {
                    sum -= (((double)pow(x,i))/(double)i);
                }
                    
            }
        }
     
    
        
        printf("Sum: %.05lf\n", sum);
    }
    /* Let the OS know everything is just peachy. */
    sum = 0;
    return 0;
   
}