char>=?

[procedure] char=? char1 char2

[procedure] char<=? char1 char2

[procedure] char<? char1 char2

[procedure] char>=? char1 char2

[procedure] char>? char1 char2

R5RS: Compare two chracters.

[procedure] char=? char1 char2 char3 ...

[procedure] char<=? char1 char2 char3 ...

[procedure] char<? char1 char2 char3 ...

[procedure] char>=? char1 char2 char3 ...

[procedure] char>? char1 char2 char3 ...

R6RS, MzScheme: Compare two or more characters.