算法竞赛入门经典第二版第一章习题-(练习Java和C++语法)

习题1-1 平均数(average)

输入三个整数,输出他们的平均值,保留三位小数

Java:

package suanfa;

import java.util.Scanner;

public class T1_1 {
    public static void main(String[] args) {
        float a,b,c;
        float aver = 0;
        Scanner reader = new Scanner(System.in);
        a = reader.nextFloat();
        b = reader.nextFloat();
        c = reader.nextFloat();
        aver = (a+b+c)/3;
        String.format("%.3f", aver);
        System.out.println("The answer is " + aver);
    }
}

 

习题1-2温度(temperature)

输入华氏温度f,输出对应的摄氏温度c,保留3位小数

Java:

package suanfa;

import java.util.Scanner;

public class T1_1 {
    public static void main(String[] args) {
        float f,c;
        Scanner reader = new Scanner(System.in);
        f = reader.nextFloat();
        System.out.println("The answer is " + String.format("%.3f ℃", (5*(f-32))/9));
    }
}

 

习题1-3联系和(sum)

输入正整数n,输出1+2+......+n的值

Java:

package suanfa;

import java.util.Scanner;

public class T1_1 {
    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        int n = reader.nextInt();
        System.out.println("The answer is " + ((n+1)*n)/2);
    }
}

 

习题1-4正弦和余弦(sin和cos)

输入正整数n(n<360),输出n度的正弦、余弦函数值。

Java:

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<math.h>
#include <stdlib.h> 
using namespace std;

const double Pi=(180/3.14159265358979);
void main()
{
 double x;
 do{
  cout<<"请输入角度:"<<endl; //角度制 °
  cin>>x;
  system("cls"); //清屏
  cout<<"sin "<<x<<"°="<<sin(x/Pi)<<endl;
  cout<<"cos "<<x<<"°="<<cos(x/Pi)<<endl;
  cout<<"tan "<<x<<"°="<<tan(x/Pi)<<endl;
 }while(1);
}

 

习题1-5打折(discount)

一件衣服95元,若消费满300元可打85折。输入购买衣服件数,输出需要支付的金额(单位:元),保留两位小数

C++:

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main(){
    double x,y;
    int a;
    while(scanf("%d", &a)!=EOF){
        //买衣服超过3件就打85折
        if(a > 3){
            y = a*95*0.85;
        }else{
            y = 95*a;
        }
        printf("%.3lf\n", y);
    }
    return 0;
}

 

posted @ 2020-11-27 21:27  佩洛君  阅读(147)  评论(0编辑  收藏  举报