# (pound)

1. n. A spare key on a phone s tiny keypad. In that capacity, often used as a data delimiter ( Enter your account number followed by the pound sign. ). See also dual-tone multiple frequency.

2. n. An abbreviation for the English-system unit of weight that s also abbreviated lb .

#define (pound define)

res. In C and C++, a preprocessor command used to define constants and macros.

#include (pound include)

res. In C and C++, a preprocessor command that incorporates the named file that follows at the current location of the current source file, prior to compilation of the current file.

#pragma (pragma)

res. In C and C++, a preprocessor command used to invoke compiler-specific functionality.

! (not)

res. The logical-NOT operator in C and various related languages. In C and C++, !foo is 0 if foo is nonzero; 1 if foo is 0.

^ (ex or)

res .The bitwise-XOR operator in C and various related languages.

(or)

res. The bitwise-OR operator in C and various related languages. The operator is easily confused with the operator. However, their behavior is in fact very different. 0x55 0x0F performs a binary OR resulting in 0x5F. 0x55 0x0F performs a logical OR that says true (nonzero) OR true, therefore true. Beware that the compiler won t warn you if you choose the wrong one.

(or)

res. The logical-OR operator in C and various related languages. Often...