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

I am using g++ 4.9.2 and need to use -Wsign-conversion to make this warning appear.

gcc.gnu.org: Warnings about conversions between signed and unsigned integers are disabled by default in C++ unless -Wsign-conversion is explicitly enabled.