Value reading and modification via pointers -- 1-D Arrays -- DSA in C

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#include<stdio.h>
 
// accessing and modifying values of array elements using pointers.
 
int main() {
 
    int arr[]={1,2,3,4,5};
 
    int *ptr, i;
 
    ptr=&arr[2]; // points to the address of arr[2]
 
    *ptr = -1; // to access and change the value of arr[2] *ptr has to be used
 
    *(ptr+1) = 0; // accesses the next element and changes it's value.
 
    *(ptr-1) = 1; // accesses the previous element and changes it's value.
 
    printf("\n Array is: ");
 
    for(i=0;i<5;i++) {
 
        printf(" %d", arr[i]);
 
    }
 
    return 0;
 
 
}

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