pta Exercise 2-13 Find the sum of the first N items of the Nth sequence

Topic Collection of Zhejiang University Edition "C Language Programming (3rd Edition)"

Exercise 2-13 Find the sum of the first N items in the Nth sequence (15 points)

This question requires writing a program to calculate the sum of the first N items of the sequence 1 + 1/2 + 1/3 + ….
Input format:
Input a positive integer N in one line.
Output format:
output the partial sum value S in the format of "sum = S" in one line, accurate to 6 digits after the decimal point. The title guarantees that the calculation result does not exceed the double precision range.
Input sample:

6

Sample output:

sum = 2.450000

Code:

#include <stdio.h>
#include <stdlib.h>

int main()
{
    
    
    int i,N;
    double sum=0;
    scanf("%d",&N);
    for(i=1;i<=N;i++){
    
    
        sum+=1.0/i;
    }
    printf("sum = %.6f",sum);
    return 0;
}

Operation result:

Note: The
defined sum is of double type, so the denominator should be 0.1, that is, this question should be written in the following form.