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Explain the concept of union of structures in C language
If the structure is nested inside a union, it is called as a union of structures. There is a possibility to create a union inside a structure in C programming language.
Example
Following is the C program for union of structures −
#include<stdio.h> struct x { int a; float b; }; union z{ struct x s; }; main ( ){ union z u; u.s.a = 10; u.s.b = 30.5; printf("a=%d", u.s.a); printf("b=%f", u.s.b); getch ( ); }
Output
When the above program is executed, it produces the following result −
a= 10 b = 30.5
Example
Given below is another C program for union of structures −
#include<stdio.h> union abc{ int a; char b; }v; int main(){ v.a=90; union abc *p=&v; printf("a=%d
",v.a);//90 printf("b=%c
",v.b);//Z printf("a=%d b=%c
",p->a,p->b);//90 Z printf("%d",sizeof(union abc));//4 return 0; }
Output
When the above program is executed, it produces the following result −
a=90 b=Z a=90 b=Z 4
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