gdb.info: Languages

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Using GDB with Different Languages

Although programming languages generally have common aspects, they are
rarely expressed in the same manner.  For instance, in ANSI C,
dereferencing a pointer `p' is accomplished by `*p', but in Modula-2,
it is accomplished by `p^'.  Values can also be represented (and
displayed) differently.  Hex numbers in C appear as `0x1ae', while in
Modula-2 they appear as `1AEH'.
   Language-specific information is built into GDB for some languages,
allowing you to express operations like the above in your program's
native language, and allowing GDB to output values in a manner
consistent with the syntax of your program's native language.  The
language you use to build expressions is called the "working language".