object MyClass {
def main(args: Array[String]): Unit = {
val mp = Map("scala" -> 4, "php" -> 2, "c++" -> 7, "python" -> 3);
for ((k, v) <- mp)
printf("key: %s value: %d\n", k, v);
}
}
/*
run:
key: scala value: 4
key: php value: 2
key: c++ value: 7
key: python value: 3
*/