# Parity flag

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In computer processors the **parity flag** indicates if the numbers of set bits is odd or even in the binary representation of the result of the last operation. It is normally a single bit in a processor status register.

For example, assume a machine where a set parity flag indicates even parity. If the result of the last operation were 26 (11010 in binary), the parity flag would be **0** since the number of set bits is **odd**. Similarly, if the result were **10** (1010 in binary) then the parity flag would be 1.