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===Return value===
If no errors occur, {{c|arg}} multiplied by 2 to the power of {{c|exp}} ({{math|arg&times;2{{su|p=exp}}}}) is returned.

If a range error due to overflow occurs, {{lc|HUGE_VAL|±HUGE_VAL}}, {{tt|±HUGE_VALF}}, or {{tt|±HUGE_VALL}} is returned.

If a range error due to underflow occurs, the correct result (after rounding) is returned.

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