C++代码笔记（1）string搜索操作——find()

Reference Book: 《C++ Primer》

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P327练习9.47：编写程序，查找string中的每个数字字符，然后查找其中每个字母字符。第一个用find_first_of，第二个用find_first_not_of。

#include <iostream>
#include <string>

using namespace std;

int main()
{
string numbers("0123456789"), name("ab2c3d7R4E6");
string::size_type pos = 0;

while((pos = name.find_first_of(numbers, pos)) != string::npos)
{
cout << "Found first number at index: " << pos
<< " element is " << name[pos] << endl;
++pos;
}
pos = 0;
while((pos = name.find_first_not_of(numbers, pos)) != string::npos)
{
cout << "Found first character at index: " << pos
<< " element is " << name[pos] << endl;
++pos;
}
}