892.2020

标签：std 892.2020 int namespace cin using include

1：

#include <bits/stdc++.h>
using namespace std;

int main() {
	int n = 10;
	double MAX, AVG = 0;
	
	cin >> AVG;
	MAX = AVG;
	for(int i = 1; i < n; i++){
		double x;
		cin >> x;
		MAX = max(MAX, x);
		AVG += x;
	}
	AVG /= 10;
	cout << MAX << "  " << AVG << endl;
	return 0;
}

　　

2：

#include <bits/stdc++.h>
using namespace std;

int main() {
	int a = 1, b = 1, n, sum = 2;
	cin >> n;
	if(n == 1){
		cout << 1 << endl;	
	}else if(n == 2){
		cout << 2 << endl;	
	}
	for(int i = 3; i <= n; i++){
		int c = a + b;
		sum += c;
		a = b;
		b = c;
	}
	cout << sum << endl;
	return 0;
}

　　

3：

#include <bits/stdc++.h>
using namespace std;

int main() {
	int	a[25][25], n;
	memset(a, 0, sizeof(a));//记得初始化 
	cin >> n; 
	a[1][1] = 1;
	for(int i = 2; i <= n; i++){
		for(int j = 1; j <= i; j++){
			a[i][j] = a[i - 1][j] + a[i - 1][j - 1];
		}
	}
	for(int i = 1; i <= n; i++){
		for(int j = 1; j <= i; j++){
			cout << a[i][j] << " ";
		}
		cout << endl;
	}
	
	return 0;
}

　　

4：

#include <bits/stdc++.h>
using namespace std;

bool is_prime(int x){
	if(x < 2)return 0;
	if(x == 2)return 1;
	for(int i = 2; i <= sqrt(x); i++){
		if(x % i == 0)return 0;
	}
	return 1;
} 
bool is_huiwen(int x){
	string s = to_string(x);
	int l = s.length();
	for(int i = 0; i < l / 2; i++){
		if(s[i] != s[l - i - 1])return 0;
	}
	return 1;
}
int main() {
	int x, y;
	cin >> x >> y;
	for(int i = x; i <= y; i++){
		if(is_prime(i) && is_huiwen(i)) cout << i << endl;
	}
	
	return 0;
}

　　

5：

#include <bits/stdc++.h>
using namespace std;

void f(int x){
	if(x){
		printf("%d", x % 10);
		f(x / 10);
	} 
}

int main() {
	int x, y;
	cin >> x;
	f(x);
	
	return 0;
}

　　

6：

#include <bits/stdc++.h>
using namespace std;


int main() {
	string s;
	int x = 0, y = 0, k = 0, ans;
	char c;
	cin >> s; 
	while(s[k] >= '0' && s[k] <= '9'){
		x = x * 10 + s[k] - '0';
		k++;
	}
	c = s[k++];
	while(s[k] >= '0' && s[k] <= '9'){
		y = y * 10 + s[k] - '0';
		k++;
	}
	if(c == '+') 		ans = x + y;
	else if(c == '-')	ans = x - y;
	else if(c == '*')	ans = x * y;
	else if(c == '/')	ans = x / y;
	cout << ans << endl;
	return 0;
}

　　

7：

#include <bits/stdc++.h>
using namespace std;


int main() {
	vector<int> a;
	int n = 100;
	for(int i = 0; i < n; i++){
		int x;
		cin >> x;
		//位运算 判断x是否为奇数 
		if(x & 1)	a.push_back(x);
	}
	sort(a.begin(),a.end());
	for(int i = 0; i < a.size(); i++){
		cout << a[i] << endl;
	}
	return 0;
}

　　

8：

 

标签：std,892.2020,int,namespace,cin,using,include
From： https://www.cnblogs.com/rongrongrong/p/16943160.html