When should we use const in a C program?

YasminRadwan26

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2022-06-23

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C programming, Interview questions, C programming Interview-questions,

YasminRadwan26

2022-06-23

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There are the following places where we need to use the const keyword in the programs.

In the call by reference function argument, if you don’t want to change the actual value which has passed in function.
```
int PrintData ( const char *pcMessage);
```
In some places, const is better than macro because const handled by the compiler and have a type checking.

const int ciData = 100;

In the case of the I/O and memory-mapped register, const is used with the volatile qualifier for efficient access.

const volatile uint32_t *DEVICE_STATUS = (uint32_t *) 0x80102040;

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