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What is the difference between normal variable and register variable in c?
Wiki User
∙ 13y ago
In C/C++ when we declare a variable;
e.g
int var;
for this variable (i.e. var) memory is being reserved in RAM (i.e out side processor).
If we declare variable like that;
register int var2;
for this variable memory is being reserved in register of CPU (i.e. withing processor)
But register variables are discouraged because processor has to work with registers.....
Note: strictly speaking, storage class 'register' means: dear compiler, you might optimize this variable into register, as I won't ever request its address. But of course, it's up to you to decide.
Wiki User
∙ 13y ago
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