C how i can write this

[faltu]

I couldn't build the algorithm logic

 

[Antero360]

I couldn't build the algorithm logic
View attachment 1886

Hi there,
Did you start on this and get stuck? If so, can you post up what you have already tried so we can take you through step by step?

 

[Deleted member 2829]

Also, please state your experience with C, if any. Have you heard of loops, for example ?

 

[Crutoy37]

One suggestion is do the factorial first, if you succeed with that it's much easier then to implement the rest of it.

 

[Deleted member 2829]

One suggestion is do the factorial first, if you succeed with that it's much easier then to implement the rest of it.

Writing a factorial function is a nice beginner exercise, but not something you'd want to do here. That would be a lousy and wasteful algorithm.
Rather, derive each term of the sequence from the previous by multiplying with x and dividing by n, and adding the term to the running sum.

 

[Crutoy37]

Wouldn't you still need to know the result of each factorial before you do x/x! ? That's how I tackled this excercise, I am sure there are better ways to do it.

 

[Deleted member 2829]

Wouldn't you still need to know the result of each factorial before you do x/x! ?

Nope. Just remember the last term, evaluate the next one, and add it to the sum.
Apparently the OP doesn't care anymore, or perhaps they were just trolling. But here is the source for it, probably as short as it will go.

#define MAX 20   /* Or as far as you want to go */   
float sum = 0, term = 1;
for ( int n = 1; n<=MAX; n++ )
{
    term *= (x/n);
    sum  += term;
}