清华大学出版社 TSINGHUA UNIVERSITY PRESS 5.3if语句 例 if (number>500)cost=0. 15 else if(number>300)cost=0. 10 else if(number>100)cost=0.075 else if(number>50)cost=0.05 else cost=0 C程序设计(第三版) http://ccf.tsinghua.edu.cn 14C程序设计(第三版) 14 http://ccf.tsinghua.edu.cn 14 5.3 if语句 例: if (number>500)cost=0.15; else if(number>300)cost=0.10; else if(number>100)cost=0.075; else if(number>50)cost=0.05; else cost=0;