45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
// ilist.cpp -- use initializer_list
|
|
#include <iostream>
|
|
#include <initializer_list>
|
|
|
|
double sum(std::initializer_list<double> il);
|
|
double average(const std::initializer_list<double> & ril);
|
|
|
|
int main()
|
|
{
|
|
using std::cout;
|
|
|
|
cout << "List 1: sum = " << sum({2,3,4})
|
|
<<", ave = " << average({2,3,4}) << '\n';
|
|
std::initializer_list<double> dl = {1.1, 2.2, 3.3, 4.4, 5.5};
|
|
cout << "List 2: sum = " << sum(dl)
|
|
<<", ave = " << average(dl) << '\n';
|
|
dl = {16.0, 25.0, 36.0, 40.0, 64.0};
|
|
cout << "List 3: sum = " << sum(dl)
|
|
<<", ave = " << average(dl) << '\n';
|
|
// std::cin.get();
|
|
return 0;
|
|
}
|
|
|
|
double sum(std::initializer_list<double> il)
|
|
{
|
|
double tot = 0;
|
|
for (auto p = il.begin(); p !=il.end(); p++)
|
|
tot += *p;
|
|
return tot;
|
|
}
|
|
|
|
double average(const std::initializer_list<double> & ril)
|
|
{
|
|
double tot = 0;
|
|
int n = ril.size();
|
|
double ave = 0.0;
|
|
|
|
if (n > 0)
|
|
{
|
|
for (auto p = ril.begin(); p !=ril.end(); p++)
|
|
tot += *p;
|
|
ave = tot / n;
|
|
}
|
|
return ave;
|
|
} |