Answer 1

c. 4294967271
In C++, if the datatypes of two values used in calculation is different from each other, the value with datatype of lower size hierarchy will be converted to the datatype of the other value which has the higher size hierarchy.
Size hierarchy : short int < unsigned short int < int < unsigned int < long int < unsigned long int
Size hierarchy for floating point numbers is : float < double < long double
In the question, 25u is an unsigned int. 50 is an int. So according to the above information, 50 will be converted from int to unsigned int. Hence, 25u - 50u is computed and the result of 4294967271 is obtained.
// I'm not sure how the conversion works though. What I am sure of was that the answer would neither be a, b or d.
// would have needed this: https://www.quora.com/How-do-I-convert-an-integer-into-an-unsigned-integer-in-C

Answer 2

@Hatsy rei
I got a headache just reading that

Answer 3

Crap. I know the answer but I can't share. No, I didn't use CP, but I've ran a code like this before. I'll give a hint though, the u defines what type of integer 25 is and this is important to the Mathematical operation being performed.

Answer 4

@Hasty Rei is correct though.

Answer 5

*mindblown*
Nice question, I wish that was excepted.
I am going have to review that.

Answer 6

what is u here ,is it for unsigned

Answer 7

@Sumita Will the final answer be signed or unsigned if one integer is an unsigned?

Answer 8

@Ace I bet it was downvoted because people did not get it.
It is a kata level question
I like it.
If I came accross it.
I would skip it, until I compiled it.

Answer 9

C for C program
I did this
https://code.sololearn.com/cKFkP4blfqt7/?ref=app

Answer 10

Wow
@Hatsy what can you do with the data type hierarchy?