Operators and Expressions

The program illustrates the use of variables in expressions and their evaluation.
#include<stdio.h>
void main()
{
float a, b, c, x, y, z;

a = 9;
b = 12;
c = 3;
x = a - b / 3 + c * 2 - 1;
y = a - b / (3 + c) * (2 - 1);
z = a -(b / (3 + c) * 2) - 1;
printf("x = %f\n", x);
printf("y = %f\n", y);
printf("z = %f\n", z);
getch();
}