字符串处理
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#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cstdio>
using namespace std;
string st;
int main()
{
//freopen("t.txt", "r", stdin);
cin >> st;
bool java = false;
bool cpp = false;
if (st[0] == '_')
{
cout << "Error!" << endl;
return 0;
}
for (int i = 0; i < st.length(); i++)
if (st[i] >= 'A' && st[i] <= 'Z')
{
if (i == 0)
{
cout << "Error!" << endl;
return 0;
}
java = true;
break;
}
if (st.find('_') != string::npos)
cpp = true;
if (cpp && java)
{
cout << "Error!" << endl;
return 0;
}
if (cpp)
{
if (st.find("__") != string::npos || st[st.length() - 1] == '_')
{
cout << "Error!" << endl;
return 0;
}
for (int i = 0; i < st.length(); i++)
if (st[i] == '_')
{
st.erase(i, 1);
st[i] = st[i] - 'a' + 'A';
}
}
else
{
for (int i = 0; i < st.length(); i++)
if (st[i] >= 'A' && st[i] <= 'Z')
{
st[i] = st[i] - 'A' + 'a';
st.insert(i, "_");
}
}
cout << st << endl;
return 0;
}