tags: tgirc早修book

Ch.02 題目練習

if else

題目

1. Zerojudge d064: ㄑㄧˊ 數？
2. Zerojudge a003: 兩光法師占卜術
3. Zerojudge d485: 我愛偶數
4. Zerojudge d065: 三人行必有我師
5. Zerojudge d066: 上學去吧！
6. Zerojudge a006: 一元二次方程式

題解

1. Zerojudge d064: ㄑㄧˊ 數？

#include<iostream>
using namespace std;

int main(){
	int n;
	cin >> n;
    
    if(n % 2 ==0){
        cout << "Even";
    }
    else{
        cout << "Odd";
    }
    
	return 0;
}

2. Zerojudge a003: 兩光法師占卜術

#include <iostream>
using namespace std;
 
int main()
{
    int M, D, S;
    cin >> M >> D;
    
    S = (M * 2 + D) % 3;
    
    if (S == 0){
        cout << "普通\n";
    }
    else if (S == 1){
        cout << "吉\n";
    }
    else {
        cout << "大吉\n";
    }
    
    return 0;
}

3. Zerojudge d485: 我愛偶數

#include<iostream>
using namespace std;

int main(){
	int a, b, ans;
	cin >> a >> b;
    
	ans = b/2 - a/2;
	ans += (a+1)%2;
    
	cout << ans;
	
	return 0;
}

4. Zerojudge d065: 三人行必有我師

#include<iostream>
using namespace std;

int main(){
	int in, max=0;
    
	for(int i = 0; i < 3; i++){
		cin >> in;
		if(in > max){
            max = in;
        }
    }
    
	cout << max;
	return 0;
}

5. Zerojudge d066: 上學去吧！

#include<iostream>
using namespace std;

int main(){
	int hh, mm;
	cin >> hh >> mm;
	
	if(hh>=8 && hh<=16){
		cout << "At School" << endl;
	}
	else if(hh == 7){
		if(mm >= 30){
			cout << "At School" << endl;
		}
		else{
			cout << "Off School" << endl;
		}
	}
	else{
		cout << "Off School" << endl;
	}
	
	return 0;
}

6. Zerojudge a006: 一元二次方程式

#include<iostream>
#include<cmath> 
using namespace std;

int main(){
	int a, b, c;
	int x1, x2;	 //兩解 
	int d;		 //判別式
	cin >> a >> b >> c;
	
	d = sqrt( b*b - 4*a*c );    //判別式
	
	if(d>0){	        //判別式>0，兩實根 
		x1 = (-b + d) / (2*a);
		x2 = (-b - d) / (2*a);
		
		cout << "Two different roots x1=" << x1 << " , x2=" << x2;
	}
	else if(d == 0){    //判別式=0，重根 
		x1 = (-b) / (2*a);
		
		cout << "Two same roots x=" << x1;
	}
	else{            //判別式<0，無實根 
		cout << "No real root";
	}
	return 0;
}