Programming in C UNIX System Calls and Subroutines using C by A. D. Marshall

By A. D. Marshall

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Consider: char *name[10]; char Aname[10][20]; We can legally do name[3][4] and Aname[3][4] in C. However is a true 200 element 2D char array. access elements via 20*row + col + base_address in memory. html#SECTION00100000000... name has 10 pointer elements. NOTE: If each pointer in name is set to point to a 20 element array then and only then will 200 chars be set aside (+ 10 elements). The advantage of the latter is that each pointer can point to arrays be of different length. Consider: char *name[] = { ``no month'', ``jan'', ``feb'', ...

This eliminates: complicated storage management. high overheads of moving lines. Multidimensional arrays and pointers We should think of multidimensional arrays in a different way in C: A 2D array is really a 1D array, each of whose elements is itself an array Hence a[n][m] notation. Array elements are stored row by row. When we pass a 2D array to a function we must specify the number of columns -- the number of rows is irrelevant. The reason for this is pointers again. C needs to know how many columns in order that it can jump from row to row in memory.

Exercises Exercise 12476 Write a program last that prints the last n lines of its text input. By default n should be 5, but your program should allow an optional argument so that last -n prints out the last n lines, where n is any integer. Your program should make the best use of available storage. html#SECTION00120000000... Write a program that sorts a list of integers in ascending order. However if a -r flag is present on the command line your program should sort the list in descending order.

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