#include <stdio.h>
float
circle(
int
r );
/* 宣告 circle 的 prototype */
void
main()
{
answer;
answer = circle(8);
printf
(
" 圓周長度是 %f"
, answer );
}
/* ====================
circle 函數, 計算 circle 的圓周長
==================== */
r )
result;
result = 3.14159 * (
double
)2 * r;
return
( result );
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