变量定义：
package package_1
object prit_first {
def main(args: Array[String]): Unit = {
val a=1;//变量定义
println(a);
}
}
for循环
package package_1
object prit_first {
def main(args: Array[String]): Unit = {
for(i<- 1 to 10)
{
println(i)
}
}
}
for双层循环
package package_1
object prit_first {
def main(args: Array[String]): Unit = {
for(i<- 1 to 4)
{
for(j<-2 to 8)
{
println(i*j)
}
}
}
}
