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A.6.2 Integral Conversions
Any integer is converted to a given unsigned type by finding the smallest non-negative value that is congruent to that integer, modulo one more than the largest value that can be represented in the unsigned type. In a two's complement representation, this is equivalent to left-truncation if the bit pattern of the unsigned type is narrower, and to zero-filling unsigned values and sign-extending signed values if the unsigned type is wider.
When any integer is converted to a signed type, the value is unchanged if it can be represented in the new type and is implementation-defined otherwise.