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#include <stdio.h>
int main(int argc, char *argv[])
{
FILE *in = stdin;
if (argc > 2) {
printf("usage: %s [file]\n", argv[0]);
return 1;
}
if (argc == 2) {
in = fopen(argv[1], "r");
if (in == NULL) {
perror(argv[1]);
return 1;
}
}
int c;
int q = 0;
while ((c = fgetc(in)) != EOF) {
if (q == 2) {
switch (c) {
case '=': putchar('#'); break;
case '/': putchar('\\'); break;
case '\'': putchar('^'); break;
case '(': putchar('['); break;
case ')': putchar(']'); break;
case '!': putchar('|'); break;
case '<': putchar('{'); break;
case '>': putchar('}'); break;
case '-': putchar('~'); break;
case '?': putchar('?'); break;
default:
printf("??%c", c);
break;
}
if (c != '?') {
q = 0;
}
} else if (c == '?') {
q++;
} else {
putchar(c);
q = 0;
}
}
return 0;
}
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