【第二章】编程题第1题编写半径为5的圆的周长计算公式为周长2半径圆周率。publicclassTestpublicstaticvoidmai
Stri
garg0doubleradius50doubleareafi
aldoublePI314159arearadiusradiusPISystemoutpri
tl
area第3题根据用户输入的数字输出“偶数”或者“奇数”。importjavautilSca
erpublicclassMai
publicstaticvoidmai
Stri
gargsSca
eri
put
ewSca
erSystemi
i
taSystemoutpri
t