C code program function development using Keil Programming

The C language program can also be implemented, and the command line parameters can be flexibly used to efficiently run the program and receive double results. The command line parameter in C language involves the main function main (INT argc, char * argv []) of the program, int argc indicates the number of command line parameters (including the executable program name itself). char * indicates the specific content of each parameter. argv [0] indicates the name of the command line execution program, [1] indicates the content of the second parameter in the command line, and so on. The following example shows the number and content of the output command line parameters: Main (INT argc, char * argv [], I = 0; while (argc> = 1) the command line parameters are most used in a drive letter, path, or part name command line, such as dir, therefore, flexible processing of such parameters can effectively improve the running effect of the program. For example, the Dir command can be followed by a drive letter, a path, or a file name. How can we set a parameter? Please refer to the following example (in this command, the program requires that you enter a parameter on the command line: drive letter, path, file name, or parameter more than one will take the default parameter "*. *"). \ * -------------------- Function: Simulate the Dir command to process the command line parameter -------------------- */# include # incdeint J, num = 0; char ss [20], path [50], path2 [50]; void main (INT argc, char * argv []) {struct ffblk F; int done; If (argc = 2) /* take the command line parameter to the array */stcpy (SS, argv [1]); elsestrcpy (SS ,″*. * ");/* assign the province parameter to the array */If (ss [strlen (SS) -1] = '\' | (ss [strlen (SS)-1] = ':') strcat (SS ,″*. * ");/* If the parameter is a path or drive letter, add ″*. * "*/getcwd (pat1, 50);/* obtain the current path */If (chdir (SS) = 0)/* determine that the parameter is the path */strcat (SS, \\*. *);/* If \ is not included at the end of the path, add *. **/chdir (path1);/* restore the original path */

 

 

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C code program function development using Keil Programming