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字串處理 (一)

我們在宣告字元陣列的時候要注意它的長度,以免位數不夠造成程式錯誤。事實上,每個字串後面都有一個 '\0' 的字元,例如 "tw" 字串,事實上總共用了 3 Bytes,若為中文字,則每個字要佔兩個字元

例如:
char str[3]="tw";
char str[9]="字串處理"

試分別利用宣告字串與宣告字元陣列的方式, 在銀幕上顯示 "Good morning!" 字樣.
  1. #include<iostream>
  2. #include<cstdlib>
  3. using namespace std;
  4. int main()
  5. {
  6.     string str1="Good morning!";
  7.     char str2[14]="Good morning!";
  8.     cout<<str1<<endl;
  9.     cout<<str2<<endl;
  10.     cout<<str1[0]<<endl;
  11.     cout<<str2[0]<<endl;
  12.     system("pause");
  13.     return 0;   
  14. }
複製代碼

  1. #include<iostream>
  2. #include<cstdlib>
  3. using namespace std;
  4. int main()
  5. {
  6.         string str="Good mroning";
  7.         char cha[13]="Good mroning";
  8.         cout<<str<<endl;
  9.         cout<<cha<<endl;      
  10.                  system("pause");
  11.         return 0;
  12. }      
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  1. #include<iostream>
  2. #include<cstdlib>
  3. using namespace std;
  4. int main()
  5. {
  6.     string str1="Good morning!";
  7.     char str2[14]="Good morning!";
  8.     cout<<str1<<endl;
  9.     cout<<str2<<endl;
  10.     cout<<str1[0]<<endl;
  11.     cout<<str2[5]<<endl;
  12.     system("pause");
  13.     return 0;   
  14. }
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  1. #include<iostream>
  2. #include<cstdlib>
  3. using namespace std;
  4. int main()
  5. {
  6.         string str="good morning";
  7.         char cha[]="good morning";
  8.         cout<<str<<endl;
  9.         cout<<cha<<endl;
  10.         system("pause");
  11.         return 0;
  12. }
複製代碼

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  1. #include<iostream>
  2. #include<cstdlib>
  3. using namespace std;
  4. int main()
  5. {
  6.     string str1="Good morning!";
  7.     char str2[14]="Good morning!";
  8.     cout<<str1<<endl;
  9.     cout<<str2<<endl;
  10.     cout<<str1[0]<<endl;
  11.     cout<<str2[0]<<endl;
  12.     system("pause");
  13.     return 0;   
  14. }
複製代碼

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  1. #include<iostream>
  2. #include<cstdlib>
  3. using namespace std;
  4. int main()
  5. {
  6.         string str1="Good morning!";
  7.         char str2[14]="Good moring!";
  8.         cout<<str1<<endl;
  9.         cout<<str2<<endl;
  10.         cout<<str1[0]<<endl;
  11.         cout<<str2[0]<<endl;
  12.         system("pause");
  13.         return 0;
  14. }
複製代碼

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  1. #include<iostream>
  2. #include<cstdlib>
  3. using namespace std;
  4. int main()
  5. {
  6.     string str1="Good morning!";
  7.     char str2[14]="Good morning!";
  8.     cout<<str1<<endl;
  9.     cout<<str2<<endl;
  10.     cout<<str1[0]<<endl;
  11.     cout<<str2[0]<<endl;
  12.     system("pause");
  13.     return 0;   
  14. }
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  1. #include<iostream>
  2. #include<cstdlib>
  3. using namespace std;
  4. int main()
  5. {
  6.         string str="Good mroning";
  7.         char cha[13]="Good mroning";
  8.         cout<<str<<endl;
  9.         cout<<cha<<endl;      
  10.                  system("pause");
  11.         return 0;
  12. }
複製代碼

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  1. #include<iostream>
  2. #include<cstdlib>
  3. using namespace std;
  4. int main()
  5. {
  6.     string str1="Good morning!";
  7.     char str2[14]="Good morning!";
  8.     cout<<str1<<endl;
  9.     cout<<str2<<endl;
  10.     cout<<str1[0]<<endl;
  11.     cout<<str2[0]<<endl;
  12.     system("pause");
  13.     return 0;   
  14. }
複製代碼

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  1. #include<iostream>
  2. #include<cstdlib>
  3. using namespace std;
  4. int main()
  5. {
  6.     string str1="Good morning!";
  7.     char str2[14]="Good morning!";
  8.     cout<<str1<<endl;
  9.     cout<<str2<<endl;
  10.     cout<<str1[0]<<endl;
  11.     cout<<str2[0]<<endl;
  12.     system("pause");
  13.     return 0;   
  14. }
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