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#include \mc\stdio.h 
 
/* 
 * Main program which processes all of its arguments, interpreting each 
 * one as a numeric value, and displaying that value as english text. 
 * 
 * Copyright 1990 Dave Dunfield 
 * All rights reserved. 
 */ 
main(argc, argv) 
	int argc; 
	char *argv[]; 
{ 
	int i; 
 
	if(argc < 2)				/* No arguments given */ 
		abort("\nUse: textnum \n"); 
 
	for(i=1; i < argc; ++i) {	/* Display all arguments */ 
		textnum(atoi(argv[i])); 
		putc('\n', stdout); } 
} 
 
/* 
 * Text tables and associated function to display an unsigned integer 
 * value as a string of words. Note the use of RECURSION to display 
 * the number of thousands and hundreds. 
 */ 
 
/* Table of single digits and teens */ 
char *digits[] = { 
	"Zero", "One", "Two", "Three", "Four", "Five", "Six", 
	"Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", 
	"Thirteen", "Fourteen", "Fifteen", "Sixteen", 
	"Seventeen", "Eighteen", "Nineteen" }; 
 
/* Table of tens prefix's */ 
char *tens[] = { 
	"Ten", "Twenty", "Thirty", "Fourty", "Fifty", 
	"Sixty", "Seventy", "Eighty", "Ninety" }; 
 
/* Function to display number as string */ 
textnum(value) 
	unsigned value; 
{ 
	char join_flag; 
 
	join_flag = 0; 
 
	if(value >= 1000) {				/* Display thousands */ 
		textnum(value/1000); 
		fputs(" Thousand", stdout); 
		if(!(value %= 1000)) 
			return; 
		join_flag = 1; } 
 
	if(value >= 100) {				/* Display hundreds */ 
		if(join_flag) 
			fputs(", ", stdout); 
		textnum(value/100); 
		fputs(" Hundred", stdout); 
		if(!(value %= 100)) 
			return; 
		join_flag = 1; } 
 
	if(join_flag)					/* Separator if required */ 
		fputs(" and ", stdout); 
 
	if(value > 19) {				/* Display tens */ 
		fputs(tens[(value/10)-1], stdout); 
		if(!(value %= 10)) 
			return; 
		putc(' ', stdout); } 
 
	fputs(digits[value], stdout);	/* Display digits */ 
}