信息学奥赛一本通习题答案（一）

信息学奥赛一本通习题答案

最近在给小学生做C++的入门培训，用的教程是信息学奥赛一本通，刷题网址为http://ybt.ssoier.cn:8088/index.php
现将部分习题的答案放在博客上，希望能给其他有需要的人带来帮助
篇幅有限，所以从分支结构开始，所有代码都可以正确提交，鉴于本人能力有限以及教学需要，部分代码写的不是那么简洁，望诸位多多指教。
以下是题号和代码
2051

#include<iostream>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a%2 == 0) cout<<"yes";
} 

2052

#include<iostream>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a > 1&&a<100) cout<<"yes";
} 

2053

#include<iostream>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a < b){
		int t = a;
		a = b;
		b = t;
	} 
	if(a < c){
		int t = a;
		a = c;
		c = t;		
	}
	if(b < c){
		int t = b;
		b = c;
		c = t;		
	}
	cout<<a<<" "<<b<<" "<<c;	
	
} 

2054

#include<iostream>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a >= 25&&a<=30) cout<<"ok!";
	else cout<<"no!";
} 

2055

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	double n,q;
	cin>>n;
	if(n<=20) q = 1.68*n;
	else if(n>20)
	q = 1.98*n;
	cout<<fixed<<setprecision(2)<<q;
}

2056

#include<iostream>
using namespace std;
int main(){
	double a,b,c;
	cin>>a>>b>>c;
	if(a<b){
		double t =a;
		a = b;
		b = t;
	}
	if(a<c){
		double t =a;
		a = c;
		c = t;		
	}
	cout<<a;
}

1039

#include<iostream>
using namespace std;
int main(){
	long int a;
	cin>>a;
	if(a>0) cout<<"positive";
	else if(a == 0) cout<<"zero";
	else if(a<0) cout<<"negative";
}

1040

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	double n,q;
	cin>>n;
	if(n>=0) q = n;
	else if(n<0)
	q = -1*n;
	cout<<fixed<<setprecision(2)<<q;
}

1041

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a%2 == 0) cout<<"even";
	else cout<<"odd"
}

1042

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	char a;
	cin>>a;
	int q =a+0;
	if(q%2 == 0) cout<<"NO";
	else cout<<"YES";
}

1043

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	int a,b;
	cin>>a>>b;
	if(a > b) cout<<">";
	else if(a == b) cout<<"=";
	else cout<<"<"; 
}

1044

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	int a;
	cin>>a;
	if(a<100&&a>10) cout<<1;
	else cout<<0;

}

1045文章来源地址https://uudwc.com/A/noVBb

#include<iostream>
#include<iomanip>
using namespace std;
int main(){
	int a,b;
	cin>>a>>b;
	if(a>=10||b>=20) cout<<1;
	else cout<<0;

}