public class HelloWorld{public static void main(String[] args){int num = 999;int count = 0;if(num>=0&&num<=999999999){do{? ? count++;? ? num/=10;}while(num!=0);System.out.println("它是個(gè)"+count+"位的數(shù)!");}else{? ? System.out.println("err");? ? ?}}}
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