3. Correct the errors in the following: ( 4 points ) // assume correct includes

Question

3.      Correct the errors in the following: (4 points)
// assume correct includes
int main()
{
int num1, num2, sum;
char again;

while ( toupper( again ) == 'Y' )
{
    cout << "Enter a number: ";
    cin >> num1;
    cout << "Enter another number: ";
    cin >> num2;
    cout << "Their sum is " << ( num1 + num2 ) << endl;
    sum += num1 + num2;
    cout << "Another time? -> ";
    cin >> again;
}

cout << "The sum of all the values is "
       << sum << endl;

return 0;
}

Explanation / Answer

part 1 : If arr represents an array, by arr[] ==>then arr represent the base addresss of the array that is the address of the first element of the array.

so arr++ should not be used in the program.

part 2: if size of string is x and assuming char size = 2 byte

total size required for the structure = 2*2*x+4+8 bytes

in question (3)

the sum is not initialized to zero hence every time the previous value of sum will be carried

e.g. if first time ==>num1=5 ; num2 =10 then ==>sum = 15

second time==>num1=5 ; num2 =10 then ==>sum = 30

so we have to add the statement

sum=0; just in the begining of while loop.

part4 : in the declaration of pointer variable the type is also declared that is what type of data is pointed by this pointer

char *p;int *p;==>on this basis system determine how many bytes to use when retrieving the value being pointed to

in the program

struct quest
{
int * ptr;
char c;
};

// elsewhere in the program
quest q;
q.ptr = 7;
q.c = "4";

the error q.ptr = 7;

q.c = "4";

instead of this we should use q->ptr=7; q.c = '4';

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