语言及算法基础篇 第一章 C++语言入门

全部刷题记录点这里

//1000:入门测试题目 
#include 
using namespace std; 
int main() {
	int a,b;
	cin >> a >> b;
	cout << a+b;
}
//2060:计算机输出 
#include 
using namespace std; 
int main()
{
	cout << "Hello World!";
}
//2061:梯形面积 
#include 
using namespace std; 
int main()
{
	float upper = 15,bottom = 25,height;
	float area = 150;
	height = area*2/upper;
	printf("%.2f",(upper+bottom)*height/2);
} 
//2062:电影票 
#include 
using namespace std; 
int main()
{
	int price = 10;
	int num;
	cin >> num;
	cout << num << " " << num*price; 
} 
//2063:牛吃牧草 
#include 
using namespace std; 
int main()
{
	int x1 = 15,y1 = 20;
	int x2 = 20,y2 = 10;
	int sum = x1*y1 > x2*y2 ? x1*y1-x2*y2 : x2*y2-x1*y1;
	int day = (y1-y2)>0 ? y1-y2:y2-y1;
	cout << sum/day;
} 
//1001:hello worlld
#include 
using namespace std; 
int main()
{
	cout << "Hello,World!";
}
//1002:输出第二个数 
#include 
using namespace std; 
int main()
{
	int a,b,c;
	cin >> a >> b >> c;
	cout << b;
}
//1003:对齐输出 
#include 
using namespace std; 
int main()
{
	int a,b,c;
	cin >> a >> b >> c;
	printf("%8d %8d %8d",a,b,c);
}
//1004:字符三角形
#include 
using namespace std; 
int main()
{
	char ch;//构造三角形的字符
	cin >> ch;
	int layers = 3;//层数 
	int i,j;
	for(i = 0;i < layers;i++){
		for(j = 0;j < layers-i-1;j++)
			cout << " ";
		for(j = 0;j < 2*i+1;j++)
			cout << ch;
		cout << endl;
	} 
} 
//1005:地球人口承载力估计 
#include 
using namespace std; 
int main()
{
	float x1,y1,x2,y2;
	cin >> x1 >> y1 >> x2 >> y2;
	float sum = x2*y2-x1*y1;
	printf("%.2f",sum/(y2-y1));
}