C Program to Find the Size of a Union

This is a C program to find the size of a Union.

Problem Description

This Program finds the size of a Union.

Problem Solution

1. Define the union.
2. Finds its size using keyword sizeof().
3. Print the same and exit.

Program/Source Code

Here is source code of the C program to find the size of a Union. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C program to find the size of a union

```
 */
```
```
#include <stdio.h>
```
```
 
```
```
void main()
```
```
{
```
```
    union sample
```
```
    {
```
```
        int   m;
```
```
        float n;
```
```
        char  ch;
```
```
    };
```
```
    union sample u;
```
```
 
```

    printf("The size of union = %d\n", sizeof(u));

```
    /*  initialization */
```
```
    u.m = 25;
```

    printf("%d %f %c\n", u.m, u.n, u.ch);

```
    u.n = 0.2;
```

    printf("%d %f %c\n", u.m, u.n, u.ch);

```
    u.ch = 'p';
```

    printf("%d %f %c\n", u.m, u.n, u.ch);

```
}
```

Program Explanation

1. Define the union named sample.
2. Declare three variables m, n and ch of different data types.
3. Use the keyword sizeof() to find the size of a union and print the same.
4. Initialize each variable with some value and print its value as output.
5. Exit.

Runtime Test Cases

 
The size of union = 4
25 0.000000 
1045220557 0.200000
1045220464 0.199999

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