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關于string的一些操作

第一個程序：string與char[]數組的對比。

#include "stdafx.h"

#include <iostream>

#include <string> //make string class available

using namespace std;

int main(int argc, char* argv[])

{

char charr1[20];

char charr2[20]="jaguar";

string str1;

string str2="panther";

cout<<"Enter a kind of feline: ";

cin>>charr1;

cout<<"Enter another kind of feline: ";

cin>>str1;

cout<<"Here are som felines:\n";

cout<<charr1<<" "<<charr2<<" "<<str1<<" "<<str2<<endl;

cout<<"The third letter in "<<charr2<<" is "<<charr2[2]<<endl;

cout<<"The third letter in "<<str2<<" is "<<str2[2]<<endl;

return 0;

}

第二個程序：賦值、拼接和附加

#include "stdafx.h"

#include <iostream>

#include <string>

using namespace std;

int main(int argc, char* argv[])

{

string s1="penguin";

string s2,s3;

cout<<"You can assign one string object to another: s2=s1\n";

s2=s1;

cout<<"s1: "<<s1<<", s2: "<<s2<<endl;

cout<<"You can assign a C-style string to a string object.\n";

cout<<"s2=\"buzzard\"\n";

s2="buzzard";

cout<<"s2: "<<s2<<endl;

cout<<"You can concatenate strings: s3=s1+s2\n";

s3=s1+s2;

cout<<"s3: "<<s3<<endl;

cout<<"You can append strings.\n";

s1+=s2;

cout<<"s1+=s2 yields s1 = "<<s1<<endl;

s2+=" for a day";

cout<<"s2 += \" for a day\" yields s2 = "<<s2<<endl;

return 0;

}

第三個程序：string對象的技術和用于字符數組的技術的對比

#include "stdafx.h"

#include <iostream>

#include <string> //make string class available

#include <cstring> //C-style string library

using namespace std;

int main(int argc, char* argv[])

{

char charr1[20];

char charr2[20]="jaguar";

string str1;

string str2="panther";

//assignment for string objects and character arrays

str1=str2; //copy str2 to str1

strcpy(charr1,charr2); //copy charr2 to charr1

//appending for string objects and character arrays

str1 +=" paste"; //add paste to end of str1

strcat(charr1," juice"); //add juice to end of charr1

//finding the length of a string object and a C-style string

int len1=str1.size(); //obtain length of str1

int len2=strlen(charr1); //obtain lenght of charr1

cout<<"The string \""<<str1<<"\" contains "<<len1<<" characters.\n";

cout<<"The string \""<<charr1<<"\" contains "<<len2<<" characters.\n";

return 0;

}

第四個程序，字符串比較問題

#include "stdafx.h"

#include <iostream>

#include <string>

using namespace std;

int main(int argc, char* argv[])

{

string word="?ate";

for(char ch='a';word!="mate";ch++)

{

cout<<word<<endl;

word[0]=ch;

}

cout<<"After loop ends,word is "<<word<<endl;

return 0;

}

posted on 2010-02-05 21:12 煙皚閱讀(277) 評論(0) 編輯收藏引用所屬分類: C++ primer plus學習筆記

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