C05-3.16分支结构3

原题链接：38471.note1

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2025-03-16 18:15:27

发布于：江苏

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一、switch开关变量的类型

#include<iostream>
using namespace std;

int main()
{
	char n; 	//注意这里的类型是 char
	cin >> n; 
	switch(n){
		case '1': cout << 1;  
		case '2': cout << 2; 
		case '3': cout << 3; break; 
		default : cout << "input error"; 
	}
	return 0;
}

homework

#include <iostream>
using namespace std;
int main()
{
	double n, money = 0;
	cin >> n;
	if (n <= 15)
		money = n * 0.47;
	else if (n <= 30)
		money = 15*0.47 + (n-15)*0.89;
	else
		money = 15*0.47 + 15*0.89 + (n-30)*1;

	printf("%.2lf", money);

	return 0;
}

二、逻辑运算符

逻辑运算符: 逻辑与(&&), 逻辑或(||)，逻辑非(!)
优先级顺序 : ! > && > ||

实例优秀学生2

#include <iostream>
using namespace std;
int main() {
    int n;
    cin >> n;
    if (n>=60 && n<=80 && n%2==0) {           
        cout << "yes";
    }
    else {
        cout << "no";
    }
    return 0;
}

实例优秀学生3

#include<iostream>
using namespace std;

int main(){
    int chinese, math;
    cin >> chinese >> math ;
    if(chinese>=90&&math>=90||chinese+math>=185) {
        cout << "yes";            
    } else {
        cout << "no"; 
    }
    return 0;
}

#include<iostream>
using namespace std;

int main(){
	
	int a = 23, b = 13, c = 0;
	
	cout << ((a>b) || (a < b)) << endl;	//1
	
	cout <<  ((a<c) && (a>b) || (a<c)) << endl; 	//0 

	cout <<  ((a<c) || (a>b) && (a>c)) << endl; 	//1
	
	cout << (!0) << endl; 

	return 0;
}

实例，闰年判断

年份:
	世纪年份 	y%100 == 0 
	普通年份	y%100 != 0 

闰年 
	世纪闰年: y%400==0 
	普通闰年: y%100!=0 && y%4==0

#include <iostream>
using namespace std;

int main(){
    int n;
    cin >> n ;
    if(n % 100 != 0 && n % 4 == 0 || n % 400 == 0){
        cout << "KeYi";
    }else {
        cout << "BuKeYi";
    }
    return 0;
}