What is the similarity between a structure, union and enumeration?

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What is the similarity between a structure, union and enumeration?



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1) What is the output of this C code?

#include <stdio.h>
struct {
int k;
char c;
};
int main()
{
struct p;
p.k = 10;
printf("%d\n", p.k);
}

2) Which of the following are themselves a collection of different data types?

3) What is the output of this C code?

#include <stdio.h>
struct student {
int no;
char name[20];
};
void main()
{
student s;
s.no = 8;
printf("hello");
}

4) What is the output of this C code(according to C99 standard)?

#include <stdio.h>
struct p {
int k;
char c;
float f;
};
int main()
{
struct p x = {.c = 97};
printf("%f\n", x.f);
}

5) How will you free the allocated memory ?

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