**Find sum of given series in which user enter a number and program calculate series using while loop.**

Series example:

if input number = 100

1/1 +1/2 +1/4 +.......+ 1/100

//this program will calculate sum of following series // 1/1 +1/2 +1/4 +.......+ 1/100. #include<iostream> #include<conio.h> using namespace std; int main() { float n=1.0; float d=2.0; float sum=1.0; float temp=0.0; cout<<"Enter a number:"; int number; cin>>number; while(d<=number) //loop will start from denominator=2 & steps 1,2 &3 continues till d=100. { temp=n/d; // 1) temp=1/2=0.5 sum=sum+temp; // 2) sum=1+0.5=1.5 d=d+2; // 3) d=2+2=4 } cout<<"sum of series is:"<<sum<<endl; getch(); return 0; }

Output:

It is recommended to dry run the code on paper and changes the series to understand more.

Find more example here: c++ simple examples source codes

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