What is difference between array of pointers and pointer to an array?

Answer:

Array of pointers means an array who content are pointers i.e. address of any type of variable. For example:

int * arr[5];  //arr is an array which can hold address of five int variables.

float **arr[10]; //arrr is an array which can hold the address of address of ten float variables.

//Program for array of pointers:

#include<stdio.h>

void main(){

    static int i=5,j=10,k=15,l=20;

    int x;

    int *arr[4]={&i,&j,&k,&l};

    for(x=0;x<4;x++)

         printf("d",*arr[x]);

}

While pointer to an array is a pointer which can hold the address of any array. For example:

int arr[5];

int (*ptr)[5];  //ptr is pointer to such array which size is five and content is int type data.

//Program for pointer to an array:

#include<stdio.h>

void main(){

    int x;

    int arr[3]={10,20,30};

    int (*ptr)[3];

    ptr=arr;

    for(x=0;x<3;x++)

         printf("%d",*ptr++);

}