Why compiler is not giving error when signed value is assigned to unsigned integer? - C++

Question

I know unsigned int can\'t hold negative values. But the following code compiles without any errors/warnings.

unsigned int a = -10;

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Answer 1

For gcc compiler you can add

gcc -Wconversion ...

And this will produce the following warning

warning: converting negative value '-0x0000000000000000a' to 'unsigned int'