C Practice Example 24
Title:There is a sequence of fractions: 2/1, 3/2, 5/3, 8/5, 13/8, 21/13... Find the sum of the first 20 terms of this sequence.
Program analysis:Please grasp the pattern of change in the numerator and denominator.
Program source code:
Example
// Created by www.example.com on 15/11/9.
// Copyright © 2015 Example. All rights reserved.
//
#include <stdio.h>
int main()
{
int i,t;
float sum=0;
float a=2,b=1;
for(i=1;i<=20;i++)
{
sum=sum+a/b;
t=a;
a=a+b;
b=t;
}
printf("%9.6f\n",sum);
}
The output of the above example is:
32.660263other extensions