Question 130001 in Visual Studio Code Question posted in
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Visual Studio Code – computing pi using recursion. Why didn't this program work?

EDIT: it seems that this code snippet works, but in visual studio it doesn’t work, i don’t know why

this program takes a command line argument "c" and it has to approximate pi using the recursive formula,

#include <stdio.h>
#include <stdlib.h>
#include <math.h>


double pi(double c) {
    if (c == 0) {
        return 4; 
    }
    double k = ((4 * pow(-1, c)) / (2 * c + 1)); 
    return k + pi(c - 1); 


}

int main(int argc, char* argv[]) {
    if (argc != 2) {
        return 1; 
    } 
    double c = strtod(argv[1], NULL); 
    if (c < 0) {
        return 1; 
    }
    double result = pi(c); 
    printf("%lf", result); 
    return 0; 
}

I can’t find the error, when I debug it, program exits with code 1 even if I use c = 10.

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2

Answers


  1. 0

    The code snippet works, as can be shown in this online compiler: Live demo

    For 10 iterations, the result it gives is:

    3.232316

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  2. 0

    When you launch the executable in Visual Studio, by default, it launches without arguments. That makes your first check fail ((argc != 2)) and return 1.

    You need to specify arguments to be passed to your executable in project settings (project properties -> debugging section -> command arguments)

    The code itself works fine.

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