求最大公约数 ............\.classpath ............\.project ............\.settings ............\.........\org.eclipse.jdt.core.prefs ............\bin ............\...\Gcd.class ............\...\Gcd1.class ............\...\ged2.class ............\src ............\...\Gcd.java ............\...\Gcd1.java ............\...\ged2.java