#include <stdio.h>
int getGirth(int a,int b,int c)
{
??? if( (a+b)<=c || (a+c)<=b || (b+c)<=a )?? //判斷是否為三角形
??? {
??????? printf("不構成三角形\n");
??????? return 0;???????????????????????????????
??? }
??? else
??? {
????? int cirf = a+b+c ;???? //計算三角形周長
????? return cirf;
??? }
??????
}

int main()
{
??? /* 定義三角形三邊長 */
??? int a, b, c;
??? a = 3;
??? b = 4;
??? c = 5;
??? printf("三角形的周長是：%d\n", getGirth(a,b,c));? //調用周長函數
??? return 0;