Classic C program input and output

#include "stdio.h"

Main ()

{File * fp;

INT I, J, N, NI;

CHAR C [160], T, CH;

IF ((FP = FOPEN ("A", "R")) == NULL)

{Printf ("File A Cannot Be Opened / N);

exit (0);

Printf ("/ n a contents are: / n");

For (i = 0; (CH = FGETC (FP))! = EOF; i )

{C [I] = CH;

PUTCHAR (C [I]);

}

Fclose (fp);

Ni = i;

IF ((fp = fopen ("b", "r")) == NULL)

{Printf ("File B Cannot Be Opened / N);

exit (0);

Printf ("/ n b contents are: / n");

For (i = 0; (CH = FGETC (FP))! = EOF; i )

{C [I] = CH;

PUTCHAR (C [I]);

}

Fclose (fp);

n = i;

For (i = 0; i

For (j = i 1; j

IF (C [I]> C [J])

{T = C [I]; C [i] = c [j]; c [j] = t;

Printf ("/ n c filile is: / n");

FP = FOPEN ("C", "W");

For (i = 0; i

{PUTC (C [I], FP);

PUTCHAR (C [I]);

}

Fclose (fp);

}