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JacobLiu-S
CppPrimer
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example_array_param.cpp
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// example: 数组形参(p193)
/*
* 定义若干print函数,功能是打印数组内容,稍微做了微调
*/
#include <iostream>
using std::cout;
using std::endl;
using std::cin;
// 使用标记指定数组长度
void print(const char *cp)
{
if (cp) // 若cp非空
while (*cp) // 只要指针所指字符非空字符
cout << *cp++; // 输出当前字符并将指针向前移动一个位置
}
// 使用标准库规范
void print(const int *beg, const int *end)
{
// 输出beg到end之间(不含end)的所有元素
while (beg != end)
cout << *beg++ << " "; // 输出当前元素并将指针向前移动一个位置
cout << endl;
}
// 显示传递一个表示数组大小的形参
// const int ia[]等价于const int* ia
// size表示数组的大小,将它显式地传给函数用于控制对ia元素的访问
void print(const int ia[], size_t size)
{
for (size_t i = 0; i != size; ++i) {
cout << ia[i] << " ";
}
cout << endl;
}
// 数组引用形参
void print(int (&arr)[10])
{
for (auto elem : arr)
cout << elem << " ";
cout << endl;
}
int main()
{
print("Hello World\n"); // void print(const char *cp)
int j[2] = {0, 1};
print(std::begin(j), std::end(j)); // void print(const int *beg, const int *end)
print(j, 2); // void print(const int ia[], size_t size)
int k[10] = {1, 2, 3, 4}; // void print(int (&arr)[10])
print(k);
return 0;
}
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