数组的运算

#include<iostream>

using namespace std;

int main()
{

//声明数组和变量
int a[5], i, sum;
double avg;

//从键盘上循环为数组赋值
for (i = 0; i < 5; i++)
{
	cout << "a[" << i << "]=";
	cin >> a[i];
}
 
//直接显示数组元素
cout << a[0] << a[1] << a[2] << a[3] << a[4] << endl;
 
//利用for循环显示数组各元素的值
for (i = 0; i < 5; i++)
{
	cout << a[i];
	cout << endl;
}
 
//计算数组元素之和,并显示计算结果
sum = a[0] + a[1] + a[2] + a[3] + a[4];
cout << sum << endl;
 
//利用循环计算数组的累加和
sum = 0;
for ( i = 0; i < 5; i++)
{
	sum += a[i];
 
}
cout << sum << endl;
 
//显示累加和及平均值
 
cout << sum << endl;
avg = sum / 5.0;
cout << avg << endl;
 
return 0;

}