time ./a.out $56.08
fifty six dollars and eight cents

real	0m0.004s
user	0m0.001s
sys	0m0.003s

i=temp2/100;
if(i==1) cout<<"One";
else if(i==2) cout<<"Two";
else if(i==3) cout<<"Three";
else if(i==4) cout<<"Four";
else if(i==5) cout<<"Five";
else if(i==6) cout<<"Six";
else if(i==7) cout<<"Seven";
else if(i==8) cout<<"Eight";
else if(i==9) cout<<"Nine";

i=temp2/100;
switch(i){
 case(1) :
  cout << "One";
  break;
 case(2) :
  cout << "Two";
  break;

//etc, etc

}

$ time ruby challange_1.rb $56.04                                             
"fifty six dollars and four cents"

real    0m0.004s
user    0m0.004s
sys     0m0.000s

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define BUFF_SIZE 1024

char *toString(int num);
char *makeString(char *buffer);

int main(int argc, char **argv){

	enum { file, arguments } mode;  //describes input type
	FILE *infile;	
	int i = -1;						//counts argument position
	char read_buffer[BUFF_SIZE], *string, *curr_pos, *decimal_ptr;
	int dollars, cents;	
	
	if(argc < 2){
		printf("Usage: ./a.out [filename][amount...]n");
		exit(1);
	}else if(argv[1][0] == '$'){
			mode = arguments;
			i = 1;
	}else{
		printf("Reading from filen");
		mode = file;
		infile = fopen(argv[1], NULL);
		if(!infile){
			printf("Unable to open %sn", argv[1]);
		}
		fgets(read_buffer, BUFF_SIZE, infile);
		printf("%sn", read_buffer);
	}
	
	while(((i > 0) && (i < argc)) || ((i < 0) && fgets(read_buffer, BUFF_SIZE, infile))){
		if(mode == file)
			string = read_buffer;
		else
			string = argv[i++];
			
		curr_pos = string;
		if(*curr_pos != '$'){
			printf("Formatting error on input: %sn", string);
			exit(1);
		}
		
		/* separate decimal from whole number amount */
		while(*curr_pos && (*curr_pos != '.')) curr_pos++;
		*curr_pos = '';
		decimal_ptr = ++curr_pos;
		curr_pos = string + 1;
		
		/* get integer values of dollars/cents */
		dollars = atoi(curr_pos);
		cents = atoi(decimal_ptr);
		char *d = (dollars == 1) ? "dollar" : "dollars";
		char *c = (cents == 1) ? "cent" : "cents";
		
		printf("%s %s and %s %sn", toString(dollars), d, toString(cents), c);
	}
}

char *toString(int num){

	char *ones[] = {"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
	char *teens[] = {"ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" };
	char *tens[] = {"twenty", "thirty", "fourty", "fifty", "sixty", "seventy", "eighty", "ninety" };
	char buffer[1024], *buff_ptr = buffer, *ret;
	buffer[0] = '';
	
	if(num == 0) return makeString(ones[0]);
			
	int index = num/100;
	if(index){
		strcpy(buff_ptr, ones[index]);
		buff_ptr += strlen(ones[index]);
		*buff_ptr++ = ' ';
		strcpy(buff_ptr, "hundred");
		buff_ptr += strlen("hundred");
		*buff_ptr = '';
	}
	num %= 100;
	
	index = num/10;
	if(index){
		if(buffer[0])
			*buff_ptr++ = ' ';
		
		if(index == 1){
			strcpy(buff_ptr, teens[num-10]);
			return makeString(buffer);
		}
		
		strcpy(buff_ptr, tens[index-2]);
		buff_ptr += strlen(tens[index-2]);
		*buff_ptr = '';
	}
	num %= 10;
	
	if(num){
		if(buffer[0])
			*buff_ptr++ = ' ';
		strcpy(buff_ptr, ones[num]);
	}
	
	return makeString(buffer);
}

char *makeString(char *buffer){
	char *ret;
	size_t len = strlen(buffer);
	if(len > 1024) return NULL;
	
	ret = malloc(sizeof(char) * len);
	strcpy(ret, buffer);
}

$ time ./a.out $56.09                                                         
 fifty six dollars and  nine cents
real    0m0.001s
user    0m0.000s
sys     0m0.000s