Thread: c++ questions

i have a few c++ questions. i will write down what the question is and my answer. i am just looking to see if i am correct.

int I = 20;
int k = 15;
int j = 5;
j = k; my answer is j = 15
k = j; my answer is k = 5
j = I; my answer is j = 20

double x = 31.2;
double y = 43.2;
double z = 0.0;
x = z; my answer is x = 0.0
y = z; my answer is y = 0.0
x = y; my answer is x = 43.2

int a = 1;
int b = 2;
a = b++; my answer is a = 2 and b++ = 2

a = ++b; my answer is a = 3 and ++b = 3

are these correct?

thanks

Originally Posted by jmarsh56

Code:

int I = 20;
int k = 15;
int j = 5;
j = k; my answer is j = 15
k = j; my answer is k = 5
j = I; my answer is j = 20

I would say you are wrong.
After the first statement "j" has the value of 15.
Now the second statement "k" has the value 15 because "j" just changed in the above statement.
Last "j" has the value 20.

Originally Posted by jmarsh56

Code:

double x = 31.2;
double y = 43.2;
double z = 0.0;
x = z; my answer is x = 0.0
y = z; my answer is y = 0.0
x = y; my answer is x = 43.2

The last answer is wrong because the previous statement change the value of "y" to 0.0. So for the last one "x" has the value 0.0

Originally Posted by jmarsh56

Code:

int a = 1;
int b = 2;
a = b++; my answer is a = 2 and b++ = 2

a = ++b; my answer is a = 3 and ++b = 3

These are wrong as well.
"a" does have the value 2 but "b" has the value 3 after the statement finishes.
Now for the second one "b" has the 3 but it is incremented before it is used so it now has the value 4. So "a" has the value 4 and so does "b".

thanks for the help now i am starting to understand this more