In the BNF Playground, define a simple grammar for the header of the main function in C$.$ The simplest main function definition you could have is this:

void main$()$

However, you could put the word "void" inside of the empty parentheses and that would be equivalent. Other options that are not equivalent are also allowed. For example, the return type could be "int". Also, if you wanted to process command line parameters, then the main function would require

exactly two parameters. The first would be of type "int" and we will require it to have the name "argc" which stands for argument count. The second parameter must be called "argv" for argument values, but its type can be defined in several equivalent ways. It can either be a pointer to character pointers, which would look like "char$**",$ or an array of character pointers $($arrays in C are basically pointers$).$ In this second case, the type before the parameter is just "char$*"$ but the fact that the type is an array is signified by changing the parameter name to "argv$[]"$