C Program to find the even numbers square and sum from 1 to 10.Even number is an integer, which is the multiple of two. In this program we use the for loop to produce the even numbers. Try to change the for loop limits you can get the various range results. Read more about C …
Exercise 5-20. Expand dcl to handle declarations with function argument types, qualifiers like const, and so on. The basic dcl treats () as “function returning” but ignores argument types. This exercise adds: parameter lists inside (), type qualifiers (const, volatile), storage classes (static, extern), and the void type. The approach: when ( is encountered and …
Exercise 5-19. Modify undcl so that it does not add redundant parentheses to expressions. K&R’s undcl (Section 5.12) converts English descriptions back into C declarations. The original adds parentheses around every pointer-to-function construct, even when they are not needed. A pointer to a function needs parentheses — int (*fp)(); a simple pointer does not — …
Exercise 5-18. Make the basic dcl program recover from input errors. K&R’s dcl program (Section 5.12) parses C declarations into English. It calls error() which prints a message and then exits — making it useless for batch input. The fix: on error, skip to the next newline and try to continue. This requires turning dcl‘s …
Exercise 5-17. Add a field-handling capability, so sorting may be done on fields within lines, each field sorted according to an independent set of options. (The index for this book was sorted with -df for the index category and -n for the page numbers.) Fields are whitespace-delimited columns. The syntax -k<field>[flags] selects a 1-based field …
Exercise 5-16. Add the -d (directory order) option, which makes comparisons only on letters, numbers and blanks. Make sure it works in conjunction with -f. Directory order ignores punctuation and control characters — only alphanumeric characters and spaces are considered. The comparison function skips non-directory characters in both strings simultaneously, then compares the next significant …