DEC2BIN Convert decimal integer to a binary string.
DEC2BIN(D) returns the binary representation of D as a string.
D must be a non-negative integer smaller than 2^52.
DEC2BIN(D,N) produces a binary representation with at least
N bits.
Example
dec2bin(23) returns '10111'
对字符'a'，调用如下：
dec2bin('a', 8)
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