题目：
修改一下程序：用string对象代替字符数组。这样，该程序将不再需要检查输入的字符串是否过长，同时将输入字符串同字符串""进行比较，以判断是否为空行。
#include <iostream>
const int ArSize = 10;
void strcount(const char* str);
int main()
{
using namespace std;
char input[ArSize];
char next;
cout << "Enter a line:\n";
cin.get(input, ArSize);
while (cin)
{
cin.get(next);
while (next != '\n')
cin.get(next);
strcount(input);
cout << "Enter next line(empty line to quit):\n";
cin.get(input, ArSize);
}
cout << "Bye\n";
return 0;
}
void strcount(const char* str)
{
using namespace std;
static int total = 0;
int count = 0;
cout << "\"" << str << "\" contains ";
while (*str++)
count++;
total += count;
cout << count << " characters\n";
cout << total << " characters total\n";
}
源代码：
#include <iostream>
#include <string>
const int ArSize = 10;
void strcount(const std::string str);
int main()
{
using namespace std;
string input;
cout << "Enter a line:\n";
getline(cin,input);
while (input != "")
{
strcount(input);
cout << "Enter next line(empty line to quit):\n";
getline(cin, input);
}
cout << "Bye\n";
return 0;
}
void strcount(const std::string str)
{
using namespace std;
static int total = 0;
cout << "\"" << str << "\" contains ";
total += str.size();
cout << str.size() << " characters\n";
cout << total << " characters total\n";
}
演示效果：
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