Exercise 5-3. Write a pointer version of the function strcat that we showed in Chapter 2: strcat(s,t) copies the string t to the end of s. The Chapter 2 version used array indexing with integer subscripts. The pointer version eliminates the index variables entirely: advance s to its null terminator, then copy t character-by-character (including …
Exercise 5-2. Write getfloat, the floating-point analog of getint. What type does getfloat return as its function value? getfloat returns int — the same as getint. This might seem surprising since it reads a double. The return value is used as a status indicator: it returns the terminating non-numeric character (so the caller can check …
Exercise 5-1. As written, getint treats a + or – not followed by a digit as a valid representation of zero. Fix getint so that it pushes such a character back on the input. K&R’s getint from Section 5.2 reads an optional sign then digits. The bug: if + or – appears but the next …