#include <stdio.h>

main(argc, argv)
int argc;
char *argv[];
{
    FILE *in_fp;
    FILE *out_fp;
    int a;
    int char_count = 0; 

    if ((in_fp = fopen(argv[1],"r")) == NULL) {
        printf("cannot open file %s\n", argv[1]);
        exit(1);
    }
    if ((out_fp = fopen(argv[2],"w")) == NULL) {
        printf("cannot open file %s\n", argv[2]);
        exit(1);
    }
    while ((a = fgetc(in_fp)) != EOF) {
        fprintf(out_fp, "%02X", a);
        if (++char_count >= 40) {
            fputc('\n', out_fp);
            char_count = 0;
        }
    }
    fputc('\n', out_fp);
    fclose(in_fp);
    fclose(out_fp);
}