#include <stdio.h>
 
/* A.1. Sa se scrie programul care citeste o pereche de valori reale x, y, 
reprezentand coordonatele unui punct in plan. 
Sa se afiseze aria cercului cu centrul in origine si avand punctul citit situat 
pe cerc, sub forma:
aria(0, 0 – x, y) = “valoare_arie”
Sa se specifice valorile operatorului sizeof aplicat variabilelor programului.*/
 
void main(void) {
 
	// declarare variabile
	float x, y, arie, PI = 3.14; // sizeof(x) = sizeof(y) = sizeof(arie) = 
								 // sizeof(float) = 4
 
	// citire x, y
	printf("Coordonatele x, y ale unui punct:"); scanf("%f%f", &x, &y); 
 
	// calcul arie = PI * raza^2 = PI * (x * x + y * y)
	arie = PI * (x * x + y * y);
 
	// afisare fx
	printf("aria(0, 0 – %f, %f) = \"%f\"", x, y, arie);
 
}

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1.2 -3.1