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**“C Programming Language (2nd Edition)“**popularly known as K & R C book.In this blog post I will give links to all the exercises from Chapter 3 of the book for easy reference.

**Chapter 3: Control Flow**

**Exercise 3-1.**Our binary search makes two tests inside the loop, when one would suffice (at the price of more tests outside). Write a version with only one test inside the loop and measure the difference in run-time.

Solution to Exercise 3-1.**Exercise 3-2.**Write a function escape(s,t) that converts characters like newline and tab into visible escape sequences like n and t as it copies the string t to s . Use a switch . Write a function for the other direction as well, converting escape sequences into the real characters.

Solution to Exercise 3-2.**Exercise 3-3.**Write a function expand(s1,s2) that expands shorthand notations like a-z in the string s1 into the equivalent complete list abc…xyz in s2 . Allow for letters of either case and digits, and be prepared to handle cases like a-b-c and a-z0-9 and -a-z . Arrange that a leading or trailing – is taken literally.

Solution to Exercise 3-3.**Exercise 3-4.**In a two’s complement number representation, our version of itoa does not handle the largest negative number, that is, the value of n equal to -(2 to the power (wordsize – 1)) . Explain why not. Modify it to print that value correctly regardless of the machine on which it runs.

Solution to Exercise 3-4.**Exercise 3-5.**Write the function itob(n,s,b) that converts the integer n into a base b character representation in the string s . In particular, itob(n,s,16) formats n as a hexadecimal integer in s

Solution to Exercise 3-5.**Exercise 3-6.**Write a version of itoa that accepts three arguments instead of two. The third argument is a minimum field width; the converted number must be padded with blanks on the left if necessary to make it wide enough.

Solution to Exercise 3-6.

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