What is const pointer in c?

Answer:  
Constant pointer is pointer which points a fixed object. For example:

int i=10;
int * const p=&i;

Here p is constant pointer which is pointing to variable i. After the initialization statement pointer p cannot points any other variable. For example:

#include<stdio.h>
void main(){
    int i=10,j=20;
    int * const p=&i;
    p=&j  //cannot modify const pointer
    printf("%d",*p);
}

Output: Compilation error
But we can modify the content of any const pointer. For example:

#include<stdio.h>
void main(){
    int i=10;
    int * const p=&i;
    *p=25;
    printf("%d",i);
}

Output: 25
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