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class Sum { int n; float f() { float sum=0; for(int i=1;i<=n;i++) sum=sum+i; return sum; } } class Average extends Sum { int n; float f() { float c; super.n=n; c=super.f(); return c/n; } float g() {float c; c=super.f(); return c/2; } } public class Cala {public static void main(String args) {Average aver=new Average(); aver.n=10; float result_1=aver.f(); float result_2=aver.g(); System.out.println("result_1="+result_1); System.out.println("result_2="+result_2); } }(程序阅读题)

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出自：2024年国家开放大学答案

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