URAL 1601. AntiCAPS （strings）

1601. AntiCAPS

Time limit: 0.5 second

Memory limit: 64 MB

The blonde Angela has a new whim: internet chats. Of course, as any blonde, shewrites her messages using the upper case. You are the moderator of Angela‘sfavorite chat and you‘re fed up with her upper-case messages. The problemis
that Angela does not respond to your warnings. You decided to write a simpleantiCAPS corrector, which would make Angela‘s messages readable.

The correction rules are very simple:

1. Sentences in a message consist of words, spaces and punctuation marks.
2. Words consist of English letters.
3. Sentences end with a full stop, exclamation mark, or question mark.
4. The first word of each sentence must start with a capital letter, and all otherletters of the sentence must be lowercase.

Input

You are given Angela‘s message, which consists of uppercase English letters,spaces, line breaks and punctuation marks: full stops, commas, dashes, colons, exclamationand question marks. Total length of message is not exceeding
10000 symbols.

Output

Output the corrected message.

Sample

HI THERE!
HOW DID YOU KNOW I AM A BLONDE?

Hi there!
How did you know i am a blonde?

Problem Author: Denis Musin

Problem Source: IX USU Open Personal Contest (March 1, 2008)

解析：注意两点：

1.每一个句子以‘.’,‘？’和‘！’结尾。每一个句子开头字符都要换成大写。

2.换行不算句子结尾的标志。

下面提供两组測试例子：

input1：

HELLO. I AM ANJELA! AND YOU?

I AM BLONDE.

output1：

Hello. I am anjela! And you?

I am blonde.

input2：

HHHHHHHHHH? SDSDFSDF! SFSDF. SDFAF

HKLLKSDJOI

output2：

Hhhhhhhhhh? Sdsdfsdf! Sfsdf. Sdfaf

hkllksdjoi

AC代码：

#include <bits/stdc++.h>
using namespace std;

int main(){
    #ifdef sxk
        freopen("in.txt", "r", stdin);
    #endif // sxk

    string s;
    int flag = 1;
    while(getline(cin, s)){
        int n = s.size();
        for(int i=0; i<n; i++){
            if(flag){
                if(s[i] >= ‘A‘ && s[i] <= ‘Z‘) flag = 0;
            }
            else{
                if(s[i] >= ‘A‘ && s[i] <= ‘Z‘) s[i] += (‘a‘ - ‘A‘);
                else if(s[i] == ‘.‘ || s[i] == ‘?‘ || s[i] == ‘!‘) flag = 1;
            }
        }
        cout<<s<<endl;
    }
    return 0;
}