C Register Storage Class

What Is Register Storage Class

• Register variables are similar to auto variables. The only difference is register variables are stored in CPU register instead of memory.
• Register variables are faster than normal variables. Mostly programmers uses register to store frequently used variables.
• Programmers can store only few variables in the CPU register because size of register is less.
• The keyword for a variable to declared under register storage class is register.

What Compiler do?

On using register keyword we are forcing the compiler not to use memory to store the data instead use CPU register.

Advantage

Accessing register variable executes faster than auto variable.

Disadvantage

One cannot dereference register variable because it has not any memory address.

Now the equation is straight forward, one cannot comes out with pointer concept using register variable.

Syntax - Register Storage Class

register int m;

C program - Register Storage Class

Let's workout a program to demonstrate register storage class in C.

#include <stdio.h>
int main()
{
int m1 = 5;
register int m2 = 10;
printf("The value of m1 : %d ",m1);
printf("\nThe value of m2 : %d ",m2);
return 0;
}

Reference

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