Doctor (to patient): "You are ill and need a quiet life. I shall prescribe you a sleeping pill, but give it to your wife."

Waitress: "Would you like some black coffee?"

Customer: "What other colours do you have?"

Son: "Mummy, does God use our bathroom?"

Mother: "No darling"

Son: "Well, every morning daddy bangs on the door and shouts, 'Oh God, are you still in there?'"

Young man: "I have come to ask for your daughter's hand."

Father: "You will have to take all of her, or it is no deal."

The .EXE Solution

In this chapter, you will learn how to invoke the DOS command interpreter file from a C program. The source code needed for this chapter is stored in the examples\Chapter2 directory. The "Chapter2" directory contains the following files:

Execute.cpp
Execute1.cpp
Execute.exe
Execute1.exe
MyFrame.jar

Listing 2.1 Execute.cpp (Complete code)

//The #include directive treats
//text in the file specified by
//filename as if it appeared in the
//current file.
#include <alloc.h>
#include <process.h>
#include <stdio.h>

//The #define directive defines a macro.
#define MAIN_CLASS "MyFrame.jar"

int main()
{

	//malloc() allocates a block of size
	//bytes from the memory heap. 
	char* cmdline = (char*)malloc(1024 );
	
	//sends formatted output to a string
	sprintf(cmdline, "java.exe -jar %s", MAIN_CLASS );

	//system() invokes the DOS 
	//command interpreter
	system( cmdline );

	//deallocate the memory
	//block. 
	free (cmdline);

	return 0;
}