primerjaj() je javna funkcija člana razreda nizov. Primerja vrednost objekta niza (ali podniza) z zaporedjem znakov, ki ga določajo njegovi argumenti.
Compare() lahko obdela več kot en argument za vsak niz, tako da lahko določite podniz z njegovim indeksom in njegovo dolžino.
Vrnitev vrste: compare() vrne celoštevilsko vrednost namesto logične vrednosti.
Različne sintakse za string::compare() :
- Sintaksa 1: primerja niz *this z nizom str.
int string::compare (const string& str) const Returns: 0 : if both strings are equal. A value <0 : if *this is shorter than str or, first character that doesn't match is smaller than str. A value>0 : če je *to daljše od str ali, je prvi znak, ki se ne ujema, večji>
CPP
// CPP code for demonstrating> // string::compare (const string& str) const> #include> using> namespace> std;> void> compareOperation(string s1, string s2)> {> >// returns a value <0 (s1 is smaller than s2)> >if>((s1.compare(s2)) <0)> >cout << s1 << ' is smaller than ' << s2 << endl;> >// returns 0(s1, is being compared to itself)> >if>((s1.compare(s1)) == 0)> >cout << s1 << ' is equal to ' << s1 << endl;> >else> >cout << 'Strings didn't match ';> > }> // Driver Code> int> main()> {> >string s1('Geeks');> >string s2('forGeeks');> >compareOperation(s1, s2);> > >return> 0;> }> |
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Izhod:
Geeks is smaller than forGeeks Geeks is equal to Geeks>
- Sintaksa 2: Primerja največ len znakov niza *this, začenši z indeksom idx z nizom str.
int string::compare (size_type idx, size_type len, const string& str) const Throws out_of_range if index>velikost().>
CPP
tipkopis zanke foreach
// CPP code to demonstrate> // int string::compare (size_type idx, size_type len,> // const string& str) const> #include> using> namespace> std;> void> compareOperation(string s1, string s2)> {> >// Compares 5 characters from index number 3 of s2 with s1> >if>((s2.compare(3, 5, s1)) == 0)> >cout << 'Here, '<< s1 << ' are ' << s2;> >else> >cout << 'Strings didn't match ';> }> // Driver Code> int> main()> {> >string s1('Geeks');> >string s2('forGeeks');> >compareOperation(s1, s2);> > >return> 0;> }> |
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Izhod:
Here, Geeks are forGeeks>
- Sintaksa 3: primerja največ len znakov niza *this, ki se začne z indeksom idx, z največ, str_len znakov niza str, ki se začne z indeksom str_idx.
int string::compare (size_type idx, size_type len, const string& str, size_type str_idx, size_type str_len) const Throws out_of_range if idx>velikost(). Vrže out_of_range, če str_idx> str.size().>
CPP
// CPP code to demonstrate> // int string::compare (size_type idx, size_type len, const string&> // str, size_type str_idx, size_type str_len) const> #include> using> namespace> std;> void> compareOperation(string s1, string s2)> {> >// Compares 5 characters from index number 0 of s1 with> >// 5 characters from index 3 of s2> >if>((s1.compare(0, 5, s2, 3, 5)) == 0)> >cout << 'Welcome to ' << s1 << s2 << ' World';> >else> >cout << 'Strings didn't match ';> }> // Driver Code> int> main()> {> >string s1('Geeks');> >string s2('forGeeks');> >compareOperation(s1, s2);> > >return> 0;> }> |
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Izhod:
razlika med tigrom in levom
Welcome, to techcodeview.com World>
- Sintaksa 4: primerja znake niza *this z znaki niza C cstr.
int string::compare (const char* cstr) const>
CPP
// CPP code to demonstrate> // int string::compare (const char* cstr) const> #include> using> namespace> std;> void> compareOperation(string s1, string s2)> {> >// returns <0 (s1 < 'techcodeview.com')> >if>((s1.compare('techcodeview.com')) <0)> >cout << s1 << ' is smaller than string ' << 'techcodeview.com';> >//returns 0 (s2 is 'forgeeks')> >if>((s2.compare('forGeeks')) == 0)> >cout << endl << s2 << ' is equal to string ' << s2;> >else> >cout << 'Strings didn't match ';> > }> // Driver Code> int> main()> {> >string s1('Geeks');> >string s2('forGeeks');> >compareOperation(s1, s2);> > >return> 0;> }> |
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delna odvisnost
Izhod:
Geeks is smaller than string techcodeview.com forGeeks is equal to string forGeeks>
- Sintaksa 5: primerja največ len znakov niza *this, začenši z indeksom idx, z vsemi znaki C-niza cstr.
int string::compare (size_type idx, size_type len, const char* cstr) const>
Upoštevajte, da cstr morda ni ničelni kazalec (NULL).
CPP
// CPP code to demonstrate> // int string::compare (size_type idx, size_type len,> // const char* cstr) const> #include> using> namespace> std;> void> compareOperation(string s1)> {> >// Compares 5 characters from 0 index of s1 with 'Geeks'> >if>((s1.compare(0, 5, 'Geeks')) == 0)> >cout << s1 << ' are ' << 'awesome people';> > >else> >cout << 'Strings didn't match ';> > }> // Driver Code> int> main()> {> >string s1('Geeks');> >compareOperation(s1);> > >return> 0;> }> |
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Izhod:
10 ml je koliko
Geeks are awesome people>
- Sintaksa 6: Primerja največ len znakov niza *this, začenši z indeksom idx, z znaki chars_len matrike znakov chars.
int string::compare (size_type idx, size_type len, const char* chars, size_type chars_len)const>
Upoštevajte, da morajo imeti chars vsaj chars_len znakov. Znaki imajo lahko poljubne vrednosti. Tako ' ' nima posebnega pomena.
CPP
// CPP code to demonstrate> // int string::compare (size_type idx, size_type len,> // const char* chars, size_type chars_len)const> #include> using> namespace> std;> void> compareOperation(string s1, string s2)> {> >// Compares 5 characters from 0 index of s1 with> >// 5 characters of string 'Geeks'> >if>((s1.compare(0, 5, 'Geeks', 5)) == 0)> >cout << 'This is ' << s1 << s2 ;> > >else> >cout << 'Strings didn't match ';> }> // Driver Code> int> main()> {> >string s1('Geeks');> >string s2('forGeeks');> >compareOperation(s1, s2);> > >return> 0;> }> |
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