1.14.3. Exercises: Pointers and Memory access

1.14.3. Exercises: Pointers and Memory access
	1.14. Pointers and Memory access

[ fromfile: pointers.xml id: None ]

Predict the output of Example 1.25

Example 1.25. src/pointers/newdelete1/newdelete1.cpp

#include <QTextStream>

int main() {
    QTextStream cout(stdout);
    const char tab = '\t';
    int n = 13;
    int* ip = new int(n + 3);
    double d = 3.14;
    double* dp = new double(d + 2.3);
    char c = 'K';
    char* cp = new char(c + 5);
    cout << *ip << tab << *dp << tab << *cp << endl;
    int* ip2 = ip;
    cout << ip << tab << ip2 << endl;
    *ip2 += 6;
    cout << *ip << endl;
    delete ip;
    cout << *ip2 << endl;
    cout << ip << tab << ip2 << endl;
    return 0;
}

Compile and run the code. Explain the output, especially the last two lines.

Modify Example 1.23 to do some arithmetic with the value pointed to by jp. Assign the result to the location in memory pointed to by ip, and print the result. Print out the values from different places in the program. Investigate how your compiler and runtime system react to placement of the output statements.
Read Chapter 22 and do experiments with the code examples.


1.14.2. Operators new and delete		1.15. Reference Variables