- C Programming Tutorial
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- C - Functions
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- C - Recursion
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- C - Arrays
- C - Properties of Array
- C - Multi-Dimensional Arrays
- C - Passing Arrays to Function
- C - Return Array from Function
- C - Variable Length Arrays
- C - Pointers
- C - Pointer Arithmetics
- C - Passing Pointers to Functions
- C - Strings
- C - Array of Strings
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- C - Arrays of Structures
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C - Array of pointers
Before we understand the concept of arrays of pointers, let us consider the following example, which uses an array of 3 integers −
#include <stdio.h> const int MAX = 3; int main () { int var[] = {10, 100, 200}; int i; for (i = 0; i < MAX; i++) { printf("Value of var[%d] = %d\n", i, var[i] ); } return 0; }
When the above code is compiled and executed, it produces the following result −
Value of var[0] = 10 Value of var[1] = 100 Value of var[2] = 200
There may be a situation when we want to maintain an array, which can store pointers to an int or char or any other data type available. Following is the declaration of an array of pointers to an integer −
int *ptr[MAX];
It declares ptr as an array of MAX integer pointers. Thus, each element in ptr, holds a pointer to an int value. The following example uses three integers, which are stored in an array of pointers, as follows −
#include <stdio.h> const int MAX = 3; int main () { int var[] = {10, 100, 200}; int i, *ptr[MAX]; for ( i = 0; i < MAX; i++) { ptr[i] = &var[i]; /* assign the address of integer. */ } for ( i = 0; i < MAX; i++) { printf("Value of var[%d] = %d\n", i, *ptr[i] ); } return 0; }
When the above code is compiled and executed, it produces the following result −
Value of var[0] = 10 Value of var[1] = 100 Value of var[2] = 200
You can also use an array of pointers to character to store a list of strings as follows −
#include <stdio.h> const int MAX = 4; int main () { char *names[] = { "Zara Ali", "Hina Ali", "Nuha Ali", "Sara Ali" }; int i = 0; for ( i = 0; i < MAX; i++) { printf("Value of names[%d] = %s\n", i, names[i] ); } return 0; }
When the above code is compiled and executed, it produces the following result −
Value of names[0] = Zara Ali Value of names[1] = Hina Ali Value of names[2] = Nuha Ali Value of names[3] = Sara Ali