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The main() function is the first C function executed after a reset.

main()
{
}

This example shows the recommended way to declare a function that requires no parameters and returns nothing.

void main( void )
{
}

This example shows a function f1 called with 2 parameters that returns the sum of the parameters. This example actually lacks a function prototype of the f1 function so that the compiler can figure out how to handle the data going to and coming from f1.

void main( void )
{
   x = f1( 10,20 );
}

int f1( int a, int b )
{
   return( a + b );
}

Corrected showing the f1 function prototype.

int f1( int, int );
void main( void )
{
   x = f1( 10,20 );
}

int f1( int a, int b )
{
   return( a + b );
}

Functions that appear before being used do not need a function prototype.

int f1( int a, int b )
{
   return( a + b );
}

void main( void )
{
   x = f1( 10,20 );
}

The f1 and f2 functions in this example are contained on 1 line. This is not recommended normally because it can be confusing.

void main( void )
{
   x = f1( 10,20 );
   y = f2( 10,20 );
}