[SOLVED] Why do I get an “undeclared” error in the main function?


This Content is from Stack Overflow. Question asked by Andreas Steffensen

I needed a square root approximation in C so i looked this post: Squareroot approximation (C) . and got this following implementation:

float x = n;
float y = 1;
float e = 0.001; // Accuracy level
if (n == 0)
    return 0;
while ((x - y) > e)
    x = (x + y) / 2;
    if (n == 0 || x == 0)
        return 0;
    y = n / x;
return x; 

Can anyone help me find the time complexity of this.
And if i have to much strain on the processor?


declare x first to use it inside main function

float x;

Like this with in the scope or you can declare globally

int main(){
  float x;
  printf("\nsquare root test 1: enter a number\n");
  printf("root(%.2f) = %.4f\n", x, squareRoot(x, .001));

  return 0;

This Question was asked in StackOverflow by user2175838 and Answered by Civa It is licensed under the terms of CC BY-SA 2.5. - CC BY-SA 3.0. - CC BY-SA 4.0.

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