area.cpp

来自「VC源代码大全（精华版）」· C++ 代码 · 共 12 行

#include   <stdio.h>

#define   AREA(x)       ((x)*(x)*3.141593)

int main()
{
    int radius = 3;
    printf ("Area = %f\n", AREA(radius));
     ++radius;
    printf ("Area = %f\n", AREA(radius));
}