sem2-problem2

#include <stdio.h>

#define STR_LEN 100

int main() {
    char s[STR_LEN], c;
    int i = 0, j;
    while ((c = getchar()) != EOF) {
        switch (c) {
            case '\n':
                s[i++] = '\\';
                s[i++] = 'n';
                break;
            case '\r':
                s[i++] = '\\';
                s[i++] = 'r';
                break;
            case '\t':
                s[i++] = '\\';
                s[i++] = 't';
                break;
            default:
                s[i++] = c;
                break;
        }
    }

    for (j = 0; j < i; j++)
        putchar(s[j]);

    return 0;
}