C Program to Display Function without using the Main Function

This is a C program to display function without using the main function.

Problem Description

This program displays function without using the main function.

Problem Solution

1. Use #define macro to rename the main.
2. Print the output and exit.

Program/Source Code

Here is source code of the C Program to display function without using the main function. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C Program to display function without using the Main Function

```
 */
```
```
#include <stdio.h>
```

#define decode(s,t,u,m,p,e,d) m##s##u##t

```
#define begin decode(a,n,i,m,a,t,e)
```
```
 
```
```
int begin()
```
```
{
```
```
    printf(" helloworld ");
```
```
}
```

Program Explanation

1. Use #define macro for doing this.
2. #define decode(s,t,u,m,p,e,d) m##s##u##t.
This code says, next time when decode is encountered with 7 parameters, replace it by the concatenation of the 4th,1st,3rd and 2nd argument.
3. #define begin decode(a,n,i,m,a,t,e). In this line the 4th, 1st, 3rd and 2nd argument are m, a, i and n respectively. So the main is replaced by begin.
4. Use function named begin and print the output as ” helloworld ” and exit.

Runtime Test Cases

Output:
 
helloworld

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