Comp Sci Why Does Using an Uninitialized Pointer Cause a Segmentation Fault in Recursion?

[anonim]

Homework Statement

Calculate the Math Formula

Relevant Equations

-

double foo(int arr[], double *ave, int index){
  double *s;
  *s=*ave;
    // calculation//
    return(foo (arr,ave,index));
// other calculation//
}

I want to keep the ave value during the recursion, because after ave is calculated, I will do another calculation is recursively in this function. But I write like this, I am getting segmentation fault.

 

[anorlunda]

Hint: How many levels deep will the recursive calls go in your code?

 

[anonim]

Hint: How many levels deep will the recursive calls go in your code?

I did not understand what you say. the function will call itself about 560 times

 

[Mark44]

Hint: How many levels deep will the recursive calls go in your code?

I did not understand what you say. the function will call itself about 560 times

Based on what you posted, the function will run until there is no more stack memory for it.

double foo(int arr[], double *ave, int index){
  double *s;
  *s=*ave;
    // calculation//
    return(foo (arr,ave,index));
// other calculation//
}

I want to keep the ave value during the recursion, because after ave is calculated, I will do another calculation is recursively in this function. But I write like this, I am getting segmentation fault.

Right, and @anorlunda's hint might have something to do with why you're getting this fault.
Are there any conditions in which the function returns without calling itself? You don't show any in this code snippet. In particular, how does the part you have commented as "other calculation" actually get executed?

 

[wle]

Homework Statement:: Calculate the Math Formula
Relevant Equations:: -

double foo(int arr[], double *ave, int index){
  double *s;
  *s=*ave;
    // calculation//
    return(foo (arr,ave,index));
// other calculation//
}

I want to keep the ave value during the recursion, because after ave is calculated, I will do another calculation is recursively in this function. But I write like this, I am getting segmentation fault.

You're assigning to the address of an uninitialised pointer:

  double *s;
  *s=*ave;

Why is s a pointer here?