const array and variable

[time to c]

i can protect data from being changed in compile time like this.

const int x=234;

but if i have to protect the data in runtime what i should do.

[ne555]

¿? The program will do as the code says.
I don't understand what you want

[time to c]

take a look at this code.

#include<stdio.h>

int main()
{
        const int pi=3.14;
        scanf("%d",&x);   
        printf("%d",x);
        return 0;
}

so in runtime if i give any input the value of pi will be changed but i don't want that to happen.
i want to make pi unchangable fully protected in runtime or compile time.

[ne555]

If you don't want to write in that variable, then don't write in that variable.

You can expect at most a warning from the compiler.
By instance gcc yields: warning: writing into constant object (argument 2) [-Wformat]

[time to c]

thanks