What is a recursive method?

Question

The variable resultado within the for is recursive?

#include <stdio.h>

int main(void) {
int N,i;
double resultado=0.0;

scanf("%d",&N);

for (i=0; i<N; i++)
  {
   resultado= 1.0 / (resultado+2); 
  }

  printf("%0.10lf\n",1.0+resultado);

return 0;
}

Answer 1

In C we have functions and not methods. Variables are not recursive, because to have recursion needs an action and variable is state.

In general it can be used in place of a repeat loop. Most of the time it should not. Leave the recursion to cases where it is more intuitive. Normal sequences work best in loops. It is possible to transform this loop into recursive function, but do not do so without a reason to do so.

Take care to make a recursive function, that is, a function that calls itself, unconditionally. When you do this it goes to infinity and never goes back to the beginning. And if you have been there will occur this site here, or the stack overflow, what will break the application by memory exhaustion that is being occupied in the pile without being released at any time.

Recursion is the repetition of something. This is recursion:

In programming is calling a routine within itself.

There are some questions on the site about the theme:

• What is a tail recursion?
• When to use recursion and when to use loops?
• What is the advantage of using recursive functions?
• Recursive code C++
• Difficulty in Syntax
• Recursive even numbers in C++

To understand recursion you need to understand recursion! Got it?

One more typical example: