#include <iostream> int main(int argc, char **argv) { std::cout << 25u - 50; return 0; }

Question

Explanation please ..

Answer 1

Hey you can test your code in Code Playground ...

Unless you wanted an explanation, for which you'd be asking for explanation rather than "Answer.?"

https://www.sololearn.com/Codes/

Answer 2

25U is an unsigned integer literal. Unsigned integer does not support negative values, that's why when you subtract (unsigned int) 25 you got a big number.

Unsigned integer unit size is approximately 4 bytes (32bit) and it support a range of value from 0 up to 4294967295 (2 raised to the power of 32, minus 1).

The big value you got there was max value for unsigned int subtracted by 25. Why 25? because the first 25 out of the 50 had subtracted 25U down to zero.