accumulate,inner_product,partial_sum,adjacent_difference

C++数值计算实例

最新推荐文章于 2025-08-18 09:41:50 发布

最新推荐文章于 2025-08-18 09:41:50 发布 · 118 阅读

本文通过C++代码演示了数值计算中的几个关键算法，包括累积求和（accumulate）、内积（inner_product）、部分求和（partial_sum）及相邻元素差（adjacent_difference）。通过具体的例子展示了如何使用STL算法来简化数值计算过程。

直接代码如下：

//数值计算
//accumulate
#include<iostream>
#include<string>
#include<algorithm>
#include<numeric>
#include<functional>
#include<vector>
using namespace std;
int main(){
	int a[]={1,2,3,4,5,6,7,8,9,10};
	vector<int>v(a,a+10);
	int max=accumulate(v.begin(),v.end(),0);
	cout<<max<<endl;
	int jianyibai=accumulate(v.begin(),v.begin()+4,1,multiplies<int>());
	cout<<jianyibai<<endl;
	system("pause");
	return 0;
}


//inner_product
#include<iostream>
#include<string>
#include<vector>
#include<numeric>
#include<algorithm>
#include<functional>
using namespace std;
int main(){
	int a[]={1,2,3,4,5,6,7,8,7,9,10};
	vector<int>v(a,a+10);
	vector<int>vv(a,a+10);
	int max=inner_product(v.begin(),v.end(),vv.begin(),1);
	cout<<max<<endl;
	
	cout<<inner_product(v.begin(),v.begin()+5,vv.begin(),1,multiplies<int>(),plus<int>());
	cout<<endl;
	system("pause");
	return 0;
}


//partial_sum
#include<iostream>
#include<string>
#include<vector>
#include<numeric>
#include<algorithm>
using namespace std;
int main(){
	int a[]={1,2,3,4,5,6};
	vector<int>v(a,a+6);
	partial_sum(v.begin(),v.end(),ostream_iterator<int>(cout," "));
	cout<<endl;

	partial_sum(v.begin(),v.end(),ostream_iterator<int>(cout," "),multiplies<int>());
	cout<<endl;
	system("pause");
	return 0;
}


//adjacent_difference
#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
#include<numeric>
#include<functional>
using namespace std;
int main(){
	int a[]={1,2,3,4,5,6,7,8,9,10};
	vector<int>v(a,a+10);
	adjacent_difference(v.begin(),v.end(),ostream_iterator<int>(cout," "));
	cout<<endl;

	adjacent_difference(v.begin(),v.end(),ostream_iterator<int>(cout," "),plus<int>());
	cout<<endl;
	system("pause");
	return 0;
}