﻿ C Program: Array pointer, contents pointer to structure

# C Exercises: Show a pointer to an array which contents are pointer to structure

## C Pointer : Exercise-20 with Solution

Write a program in C to show a pointer to an array whose contents are pointers to structures.

Pictorial Presentation:

Sample Solution:

C Code:

``````#include <stdio.h>
struct employee
{
char *empname;
int empid;
};

int main()
{
printf("\n\n Pointer : Show a pointer to an array which contents are pointer to structure :\n");
printf("-----------------------------------------------------------------------------------\n");

static struct employee emp1={"Jhon",1001},emp2={"Alex",1002},emp3={"Taylor",1003};
struct employee(*arr[])={&emp1,&emp2,&emp3};
struct employee(*(*pt)[3])=&arr;

printf(" Exmployee Name : %s \n",(**(*pt+1)).empname);
printf("---------------- Explanation --------------------\n");
printf("(**(*pt+1)).empname\n");
printf("= (**(*&arr+1)).empname   as pt=&arr\n");
printf("= (**(arr+1)).empname     from rule *&pt = pt\n");
printf("= (*arr[1]).empname       from rule *(pt+i) = pt[i]\n");
printf("= (*&emp2).empname        as arr[1] = &emp2\n");
printf("= emp2.empname = Alex       from rule *&pt = pt\n\n");
printf(" Employee ID :  %d\n",(*(*pt+1))->empid);
printf("---------------- Explanation --------------------\n");
printf("(*(*pt+1))-> empid\n");
printf("= (**(*pt+1)).empid     from rule -> = (*).\n");
printf("= emp2.empid = 1002\n");
printf("\n\n");
return 0;
}
```
```

Sample Output:

``` Pointer : Show a pointer to an array which contents are pointer to structure :
-----------------------------------------------------------------------------------
Exmployee Name : Alex
---------------- Explanation --------------------
(**(*pt+1)).empname
= (**(*&arr+1)).empname   as pt=&arr
= (**(arr+1)).empname     from rule *&pt = pt
= (*arr[1]).empname       from rule *(pt+i) = pt[i]
= (*&emp2).empname        as arr[1] = &emp2
= emp2.empname = Alex       from rule *&pt = pt

Employee ID :  1002
---------------- Explanation --------------------
(*(*pt+1))-> empid
= (**(*pt+1)).empid     from rule -> = (*).
= emp2.empid = 1002
```

Flowchart:

C Programming Code Editor:

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## C Programming: Tips of the Day

What is the static function in C ?

Making a function static hides it from other translation units, which helps provide encapsulation.

helper_file.c

```int f1(int);        /* prototype */
static int f2(int); /* prototype */

int f1(int foo) {
return f2(foo); /* ok, f2 is in the same translation unit */
/* (basically same .c file) as f1         */
}

int f2(int foo) {
return 42 + foo;
}
```

main.c:

```int f1(int); /* prototype */
int f2(int); /* prototype */

int main(void) {
f1(10); /* ok, f1 is visible to the linker */
f2(12); /* nope, f2 is not visible to the linker */
return 0;
}
```

Ref : https://bit.ly/3CI9ebJ

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