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int char_to_int(char a) {        const char nums[] = "0123456789";        for(int i=0; i < 10; ++i) {                if (nums[i] == a) {                        return i;                }        }        return 0;}char int_to_char(int n) {        const char nums[] = "0123456789";        if (n < 0 || n > 9) {                return 0;        }        return nums[n];}