Constant qualifier in C

We use the const qualifier to declare a variable as a constant. This means that once a variable is initialized, we cannot change its value. There are great benefits to using const. For example, if you have a constant value of PI, you don't want any part of your program to modify that value. Therefore, you should declare it as const.

Objects declared with a const-qualified type may be placed in read-only memory by the compiler, and may not be stored at all if the address of the const object is never obtained in the program. For example,

Example

#include<stdio.h>
int main() {
   const int x = 10;
   x = 12;
   return 0;
}

Output

[Error] assignment of read-only variable 'x'

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