Exercise 4-7. Write a routine ungets(s) that will push back an entire string onto the input. Should ungets know about buf and bufp, or should it just use ungetch? The answer is: ungets should use ungetch, not access buf and bufp directly. This is the principle of information hiding — getch and ungetch own the …
Exercise 4-3. Given the basic framework, it’s straightforward to extend the calculator. Add the modulus (%) operator and provisions for negative numbers. This exercise extends the RPN desk calculator from K&R Section 4.3. Two independent additions: Modulus operator % — pop two operands, cast to int, apply %, push result. Floating-point modulus is mathematically well-defined …
A C program to print factors of a number finds all positive integers that divide the number evenly (with no remainder). These are also called divisors. For 12: the factors are 1, 2, 3, 4, 6, and 12. Every number has at least two factors: 1 and itself. A number with exactly two factors is …
Write a c program to implement topological sort.Topological sort is the ordering vertices of a directed, acyclic graph(DAG), so that if there is an arc from vertex i to vertex j, then i appears before j in the linear ordering. Read more about C Programming Language . /************************************************************ You can use all the programs on …
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) should produce in s a hexadecimal string. itob generalises itoa from base 10 to any base 2–36. The only change to the digit-extraction loop is replacing n % 10 with n …
C Program to get the system information. We can use the ‘uname’ function to get the system information, which is defined in the “sys/utsname.h” library.Structure is used to hold information returned by the uname function.“uname” function members and their use:sysname returns the name of the operating system in use.release returns the current release level of …