C++ Tutorial/string/string subscript indexer — различия между версиями
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Версия 17:21, 25 мая 2010
Содержание
Accessing characters in a string
<source lang="cpp">#include <iostream>
- include <string>
- include <cctype>
using std::cout; using std::cin; using std::endl; using std::string; int main() {
string text = "asdffdsaasdf";
int vowels = 0; int consonants = 0; for(int i = 0 ; i < text.length() ; i++) if(std::isalpha(text[i])) switch(std::tolower(text[i])) { case "a": case "e": case "i": case "o": case "u": vowels++; break; default: consonants++; } cout << "Your input contained " << vowels << " vowels and " << consonants << " consonants." << endl; return 0;
}</source>
Your input contained 3 vowels and 9 consonants.
accessing characters in string objects
<source lang="cpp">#include <iostream>
#include <string> using namespace std; int main(){ char charray[80]; string word; cout << "Enter a word: "; cin >> word; int wlen = word.length(); cout << "One character at a time: "; for(int j=0; j<wlen; j++) cout << word.at(j); word.copy(charray, wlen, 0); charray[wlen] = 0; cout << "\nArray contains: " << charray << endl; return 0; }</source>
Is it a string::npos
<source lang="cpp">#include <iostream>
- include <string>
using namespace std; int main() {
string word1 = "Game"; string word2("Over"); string word3(3, "!"); string phrase = word1 + " " + word2 + word3; cout << phrase << endl;
if (phrase.find("eggplant") == string::npos) cout << ""eggplant" is not in the phrase.\n\n"; return 0;
}</source>
Modify char in a string by indexer
<source lang="cpp">#include <iostream> using std::cout; using std::endl;
- include <string>
using std::string; int main() {
string string1( "cat" ); string string2; string string3; string2 = string1; string3.assign( string1 ); cout << "string1: " << string1 << "\nstring2: " << string2 << "\nstring3: " << string3 << "\n\n"; string2[ 0 ] = string3[ 2 ] = "r"; cout << "string1: " << string1 << "\nstring2: " << string2 << "\nstring3: ";
return 0;
}</source>
string1: cat string2: cat string3: cat string1: cat string2: rat string3: "
switch statement based on char value
<source lang="cpp">#include <iostream>
- include <string>
- include <cctype>
using std::cout; using std::cin; using std::endl; using std::string; int main() {
string text = "asdffdsaasdf";
int vowels = 0; int consonants = 0; for(int i = 0 ; i < text.length() ; i++) if(std::isalpha(text[i])) switch(std::tolower(text[i])) { case "a": case "e": case "i": case "o": case "u": vowels++; break; default: consonants++; } cout << "Your input contained " << vowels << " vowels and " << consonants << " consonants." << endl; return 0;
}</source>
Your input contained 3 vowels and 9 consonants.