#include <stdio.h>
#include <iostream>
#include <conio.h> //header to keep execution window open

int main(int argc, char *argv[])

{
	int  c, i, letter[26], digit[10];
	FILE  *ifp, *ofp;

	if (argc !=3)
	{
		printf("\n%s%s%s\n\n%s\n%s\n\n", 
			"Usage:   ", argv[0], " infile outfile",
			"The uppercase letters in infile will be counted.",
			"The results will be written in outfile.");
		exit(1);
	}
	ifp = fopen(argv[1], "r");
	ofp = fopen(argv[2], "w");
	for (i = 0; i < 36; ++i)        // initialize array to zero
		letter[i] = 0, digit[i] = 0;
	while ((c = getc(ifp)) != EOF)
		if (c >= 'A' && c <= 'Z')  // search for uppercase letters
			++letter[c - 'A'];
		else if (c >= '0' && c <='9') // count numbers in file
			++digit[c - '0'];
	for (i = 0; i < 36; ++i)
	{
		if (i % 3 == 0)
			putc('\n', ofp);
		fprintf(ofp, "%c occured  %3d  times", 'A' + i, letter[i], '0' + i, digit[i]);
	}
	putc('\n', ofp);
         
       _getch(); //used to keep execution window open
}