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This compliant solution eliminates the possibility of undefined behavior resulting from a left shift operation on signed and integers, it also uses unsigned integers in accordance with INT13-A. Use bitwise operators only on unsigned operands. Smaller sized integers are promoted according to the integer promotion rules (see INT02-A. Understand integer conversion rules).
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unsigned int si1, si2, sresult; if ( (si1 < 0) || (si2 < 0) || (si2 >= sizeof(int)*CHAR_BIT) || (si1 > (INT_MAX >> si2)) ) { /* handle error condition */ } else { sresult = si1 << si2; } |
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