Example 12.7 Write a program that will receive a filename and a line of text as command line arguments and write the text to the file. Figure 12.7 shows the use of command line arguments. The command line is F12 7 TEXT AAAAAA BBBBBB CCCCCC DDDDDD EEEEEE FFFFFF GGGGGG Each word in the command line is an argument to the main and therefore the total number of arguments is 9. The argument vector argv[1] points to the string TEXT and therefore the statement fp = fopen(argv[1], "w"); %3D opens a file with the name TEXT. The for loop that follows immediately writes the remaining 7 arguments to the file TEXT.

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Stack operations

A stack is a linear data structure that follows certain order to perform the operation; the order will be LIFO (Last In First Out) data structure. In the stack data structure elements/items are removed and added only from the top. The topmost stack item/element is pointed by the top pointer and the element which is added to the stack first will get deleted at the last.