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This compliant solution uses an unsigned int bit-field and does not depend on implementation-defined behavior.:

Code Block

bgColor	#ccccff
lang	c

struct {
  unsigned int a: 8;
} bits = {255};

int main(void) {
  printf("bits.a = %d.\n", bits.a);
  return 0;
}

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CERT C++ Secure Coding Standard	INT12-CPP. Do not make assumptions about the type of a plain int bit-field when used in an expression
ISO/IEC TR 24772:2013	Bit Representations [STR]
MISRA - C:2012	Rule 12.7Rule 10.1 (required)

Bibliography

Section 6.3.1.1, "Boolean, Characters, and Integers"

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