36 lines
1.3 KiB
C++
36 lines
1.3 KiB
C++
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// ptrstr.cpp -- using pointers to strings
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#include <iostream>
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#include <cstring> // declare strlen(), strcpy()
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int main()
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{
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using namespace std;
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char animal[20] = "bear"; // animal holds bear
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const char * bird = "wren"; // bird holds address of string
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char * ps; // uninitialized
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cout << animal << " and "; // display bear
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cout << bird << "\n"; // display wren
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// cout << ps << "\n"; //may display garbage, may cause a crash
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cout << "Enter a kind of animal: ";
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cin >> animal; // ok if input < 20 chars
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// cin >> ps; Too horrible a blunder to try; ps doesn't
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// point to allocated space
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ps = animal; // set ps to point to string
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cout << ps << "!\n"; // ok, same as using animal
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cout << "Before using strcpy():\n";
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cout << animal << " at " << (int *) animal << endl;
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cout << ps << " at " << (int *) ps << endl;
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ps = new char[strlen(animal) + 1]; // get new storage
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strcpy(ps, animal); // copy string to new storage
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cout << "After using strcpy():\n";
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cout << animal << " at " << (int *) animal << endl;
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cout << ps << " at " << (int *) ps << endl;
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delete [] ps;
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// cin.get();
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// cin.get();
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return 0;
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}
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