Mavzu: satrlar va kengaytirilgan belgilar

int i,j; i=s1.find(s2); j=s1.rfind(s2);
cout << i; // 4
cout << j; // 11
cout << s1.find(‘3’) <
cout << s1.rfind(‘3’) <
cout << s1.find_first_of (s3) <
cout << s1.find_last_of (s3) <
cout << s1.find_first_not_of (s2) <
cout << s1.find_last_not_of (s2) <
getch();
}


Satrni qismini solishtirish
Satrlarni to‘liq solishtirish uchun solishtirish amallari ishlatiladi, qismini solishtirish uchun compare funksiyasi ishlatiladi:
int compare ( const string &str) const;
int compare (unsigned int pos1, unsigned int n1, const string & str) const;
int compare (unsigned int pos1, unsigned int n1, const string & str, unsigned int pos2, unsigned int n2) const;
Funksiya ni birinchi shakli ikki satrni butunlay solishtiradi va manfiy son qaytaradi chaqiruvchi satr str dan kichik bo‘lsa, 0 qaytaradi agar ular teng bo‘lsa va musbat son qaytaradi chaqiruvchi satr katta bo‘lsa.
Ikkinchi shaklda xudii oldingiday amallar bajariladi faqat chaqiruvchi satrni pos1 o‘rnidan boshlab n1 ta belgili satr str satr bilan solishtiriladi.
Uchinchi shaklda chaqiruvchi satrdan pos1 o‘rnidan boshlab n1 ta belgi va str satrdan ros2 o‘rnidan boshlab n2 ta belgi o‘zaro solishtiriladi.
Yangi va eski turdagi satrlarni solishtirish yuqorida ko‘rsatilganday funksiyalar mavjud. Misol:
#include
#inclde
using namespace std;
int main(){
string s1=”01234567893456ab2csef”,s2 =”456”,s3=”ghk”;
cout << “s1=”<
cout << “s2=”<
cout << “s3=”<
if (s2.compare(s3)>0) cout << “s2>s3”<
if (s2.compare(s3)==0) cout << “s2=s3”<
if (s2.compare(s3)<0) cout << “s2
if (s1.compare(4,6,s2)>0) cout << “s1[4-9]>s2”<
if (s1.compare(5,2,s2,1,2)==0) cout << “s1[5-6]=s2[1-2]”<
getch();
}
Satrni xususiyatlarini aniqlash funksiyalari
String sinfida satrini uzunligi, bo‘shligi va xotira xajmini aniqlaydigan funksiyalar bor.
unsigned int size() const; // chaqiruvchi satrni xotiradagi xajmi
unsigned int length() const; // chaqiruvchi satrni elementlar soni
unsigned int max_size() const; // satrni max uzunligi(4294967295)
unsigned int capacity() const; // satr egallagan xotira xajmi
bool empty() const; // Rost agar satr bo‘sh bo‘lsa