Syntax for user defined function

Answer 1

return_type function_name( parameter list )
{
body of the function
}

This will work if used before the main(). If you want to put body after main() than you need to declare it above main like so :

return_type function_name( parameter list );

and than after main you define it using the previous syntax. i.e. this :

return_type function_name( parameter list )
{
body of the function
}

Eg :

void print_nothing () {
printf("nothing");
}

int main(){
print_nothing();
return 0;
}

OR the same can be done in this way :

void print_nothing();

int main(){
print_nothing();
return 0;
}

void print_nothing () {
printf("nothing");
}

Both are possible ways.