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

double norma(double x, double y) {
    return sqrt( pow(x,2.0) + pow(y,2.0) );
}

int main() {
    // vettore (x,y)
    double x = 0.0;
    double y = 1.0;
    printf("|(%.2lf,%.2lf)| = %lf", x,y,norma(x,y)) ;
}