C语言程序设计教程（第三版）课后习题6.5 （Java代码）

import java.util.Scanner;

import java.text.DecimalFormat;

public class Main {

        public static void add(float a,float b,float c){

                float sumA = 0;

                float sumB = 0;

                float sumC = 0;

                for(int i=0;i<a;i++){

                        sumA+=i+1;

                }

                for(int i=0;i<b;i++){

                        sumB+=(i+1)*(i+1);

                }

                DecimalFormat df = new DecimalFormat("#.00");

                for(float i=0;i<c;i++){

                        sumC+=1/(i+1);

                }

                float sum = sumA+sumB+sumC;

                System.out.print(df.format(sum));

                }

        public static void main(String[] arg){

                Scanner sc = new Scanner(System.in);

                float a = sc.nextFloat();

                float b = sc.nextFloat();

                float c = sc.nextFloat();

                add(a,b,c);

        }

}