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#include <stdio.h>
 
int main(void) {
	int raggio;
	scanf ("%d", &raggio);
	printf ("%s", "Il raggio equivale a: %d\n", raggio);
 
	int diamentro;
	diametro = raggio * 2;
	scanf ("%d", &diametro);
	printf ("%s", "Il diametro equivale a: %d\n", diametro);
 
	float pgreco;
	pgreco = 3.14;
	scanf ("%f", &pgreco);
 
	float circonferenza;
	circonferenza = 2 * pgreco * raggio;
	scanf ("%f", &circonfereza);
	printf ("%s", "La circonferenza equivale a: %f\n", circonferenza);
 
	float area;
	area = pgreco* raggio * raggio;
	scanf ("%f", &area);
	printf ("%s", "L'area equivale a: %f\n", area);
	return 0;
}
 

prog.c: In function ‘main’:
prog.c:6:10: warning: too many arguments for format [-Wformat-extra-args]
  printf ("%s", "Il raggio equivale a: %d\n", raggio);
          ^~~~
prog.c:9:2: error: ‘diametro’ undeclared (first use in this function)
  diametro = raggio * 2;
  ^~~~~~~~
prog.c:9:2: note: each undeclared identifier is reported only once for each function it appears in
prog.c:19:16: error: ‘circonfereza’ undeclared (first use in this function)
  scanf ("%f", &circonfereza);
                ^~~~~~~~~~~~
prog.c:20:10: warning: too many arguments for format [-Wformat-extra-args]
  printf ("%s", "La circonferenza equivale a: %f\n", circonferenza);
          ^~~~
prog.c:25:10: warning: too many arguments for format [-Wformat-extra-args]
  printf ("%s", "L'area equivale a: %f\n", area);
          ^~~~
prog.c:8:6: warning: unused variable ‘diamentro’ [-Wunused-variable]
  int diamentro;
      ^~~~~~~~~

Standard output is empty