Question

Given the following code segment, tell the output if it is part of an executable program. Assume the addresses of the variables, a and b, are 0012A32A and 0012A340, respectively.

       int* intPtr1, *intPtr2;

       int a = 10, b;

       intPtr1 = &a;

       cout<< "The data in a is "<<a<<endl;

       cout << "The address of a is "<<&a<<endl;

       cout <<"The data in intPtr1 is "<< intPtr1 <<endl;

       cout <<"The data in the variable pointed by intPtr1 is "<< * intPtr1<<endl;

       a++;

       cout << "After changing a: "<<endl;

       cout <<"The data in the variable pointed by intPtr1 is "<< * intPtr1<<endl;

       b = *intPtr1;

       cout << "The value in b is "<<b<<endl;

       a++;

       cout << "After changing a: "<<endl;

       cout <<"The data in the variable pointed by intPtr1 is "<< * intPtr1<<endl;

       cout << "The value in b is "<<b<<endl;

Output:

     

Please Use C++

Answer 1

The data in a is 10
The address of a is 0012A32A
The data in intPtr1 is 0012A32A
The data in the variable pointed by intPtr1 is 10
After changing a: 
The data in the variable pointed by intPtr1 is 11
The value in b is 11
After changing a: 
The data in the variable pointed by intPtr1 is 12
The value in b is 11

Explanation inside comment:

int *intPtr1, *intPtr2;

        int a = 10, b;
        //initialize a = 10

        intPtr1 = &a;
        //intptr1 stores address of variable a
    //intptr1 = 0012A32A

        cout << "The data in a is " << a << endl;
        //print value stored in a = 10

        cout << "The address of a is " << &a << endl;
        //print address of a = 0012A32A

        cout << "The data in intPtr1 is " << intPtr1 << endl;
        //print value stored in intPtr1 which is address of a = 0012A32A

        cout << "The data in the variable pointed by intPtr1 is " << *intPtr1 << endl;
        //print value stored at address in intPtr1 = 10

        a++;
        //increment a; a = 11
        cout << "After changing a: " << endl;

        cout << "The data in the variable pointed by intPtr1 is " << *intPtr1 << endl;
        //print value stored at address in intPtr1 = 11

        b = *intPtr1;
        //b = value stored at intPtr1 => b = 11

        cout << "The value in b is " << b << endl;
        //print value stored in b = 11

        a++;
        //increment a; a = 12 only a value is changed here

        cout << "After changing a: " << endl;

        cout << "The data in the variable pointed by intPtr1 is " << *intPtr1 << endl;
        //print value stored at address in intPtr1 = 12

        cout << "The value in b is " << b << endl;
        //print value stored in b = 11