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±ê×¼cÀïÈçºÎ¶ÁÈ¡ÊäÈëµÄbackspace

Write a program to copy its input to its output, replacing each tab by \t , each backspace by \b , and each backslash by \\ . This makes tabs and backspaces visible in an unambiguous way.

#include <stdio.h>

int main()
{
¡¡¡¡int c, d;

¡¡¡¡while ( (c=getchar()) != EOF) {
¡¡¡¡¡¡¡¡d = 0;
¡¡¡¡¡¡¡¡if (c == '\\') {
¡¡¡¡¡¡¡¡¡¡¡¡putchar('\\');
¡¡¡¡¡¡¡¡¡¡¡¡putchar('\\');
¡¡¡¡¡¡¡¡¡¡¡¡d = 1;
¡¡¡¡¡¡¡¡}
¡¡¡¡¡¡¡¡if (c == '\t') {
¡¡¡¡¡¡¡¡¡¡¡¡putchar('\\');
¡¡¡¡¡¡¡¡¡¡¡¡putchar('t');
¡¡¡¡¡¡¡¡¡¡¡¡d = 1;
¡¡¡¡¡¡¡¡}
¡¡¡¡¡¡¡¡if (c == '\b') {
¡¡¡¡¡¡¡¡¡¡¡¡putchar('\\');
¡¡¡¡¡¡¡¡¡¡¡¡putchar('b');
¡¡¡¡¡¡¡¡¡¡¡¡d = 1;
¡¡¡¡¡¡¡¡}
¡¡¡¡¡¡¡¡if (d == 0)
¡¡¡¡¡¡¡¡¡¡¡¡putchar(c);¡¡¡¡¡¡¡¡
¡¡¡¡}
¡¡¡¡return 0;
}

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