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C Exercises: Show a pointer to union

C Pointer : Exercise-19 with Solution

Write a program in C to show a pointer to union.

Pictorial Presentation:

C Exercises: Pictorial: Show a pointer to union.

Sample Solution:

C Code:

#include <stdio.h>
union empAdd
{
char *ename;
char stname[20];
int pincode;
};

int main()
{
 	printf("\n\n Pointer : Show a pointer to union :\n"); 
	printf("----------------------------------------\n");
    union empAdd employee,*pt;
    employee.ename="Jhon Mc\0Donald";//assign  the string up to null character i.e. '\0'

    pt=&employee;

    printf(" %s %s\n\n",pt->ename,(*pt).ename);

    return 0;
}

Sample Output:

 Pointer : Show a pointer to union :                                                                          
----------------------------------------                                                                      
 Jhon Mc Jhon Mc 

Flowchart:

Flowchart: Show a pointer to union

C Programming Code Editor:

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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP