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CS253: Problem Solving with C++

Spring 2013

Example String Cast

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A String Example

Consider this code--what does it display?

#include <iostream>
#include <string>
using namespace std;
int main() {
    string a="hello", b=a;
    a[0]='j';
    cout << a << ' ' << b << endl;
    return 0;
}

Now, consider this code. This code is evil, because it casts the result of a.data() to be writable. However, its result may be surprising. What does it display?

#include <iostream>
#include <string>
using namespace std;
int main() {
    string a="hello", b=a;
    char *p = (char *) a.data();
    *p = 'm';
    cout << a << ' ' << b << endl;
    return 0;
}