0923 "Operating System Tutorial" experiment one · The programming of DOS command interpreter

Programming of a DOS command interpreter

I. Purpose and REQUIREMENTS

1. Purpose of the experiment

(1) recognize DOS;

(2) master the Principle of command interpretation procedure;

(3) master the simple DOS call method;

(4) Master C Language programming preliminary.

2. Experimental requirements

Write a command-line interpreter similar to DOS,UNIX

(1) self-defined system prompt

(2) custom set of commands (8-10 )

(3) user input Help to find commands

(4) List the function of the command, distinguish internal or external commands

(5) user input quit quit

(6) internal commands are dir, CD, Md,rd, CLS, date, time, Ren, copy , etc.

Ii. contents of the experiment

According to the requirements, complete the design, coding, testing work.

Third, the experimental environment

1. pc microcomputer

2. Windows operating system

3. a /C + + program Development Integration Environment

Four, the experimental principle and the core algorithm reference program segment

#include<stdio.h>

#include<string.h>

void Main () {

　　Char command[20];

　　char s[20][20]={"dir", "CD", "MD", "RD", "CLS", "Date", "Time", "Ren", "Copy", "Help", "quit", "haha", "hehe", " Xixi "};

　　int Count,key;

　　 while (strcmp (Command, "quit")!=0) {

　　　　printf ("Please input command:\n");

　　　　gets (command);

　　　　 for (count=0;count<20;count++) {

　　　　　　if (strcmp (Command,s[count]) ==0) {

Key=count;

}

}

　　　　Switch (key) {

　　　　　　 case 0:

　　　　　　　　printf ("dir means no parameters: View files and folders in the current directory \ n");

　　　　　　　　Break

　　　　　　 Case 1:

　　　　　　　　printf ("CD directory name: Enter a specific directory. \ n ");

　　　　　　　　Break

Case 2:

printf ("MD directory Name: Create a specific folder. dos under the habit called Directory,win under the habit called folder \ n ");

　　　　　　　　Break

Case 3:

　　　　　　　　printf ("Rd directory Name: delete a specific folder.") \ n ");

　　　　　　　　Break

Case 4:

printf ("CLS directory Name: Indicates clear screen function \ n");

　　　　　　　Break

Case 5:

printf ("Data set Date command, function is set date \ n");

　　　　　　　　Break

Case 6:

printf (" Time system Clock setting command, function: Set or display system period. \ n ");

　　　　　　　　Break

Case 7:

printf ("Ren means the file is renamed, andtheren command is in the format: thefile name of theren source file name. \ n ");

　　　　　　　　Break

Case 8:

printf ("Copy means copy command, copy information of his function \ n");

　　　　　　　　Break

Case 9:

printf (" I'm not going to save you \ n");

　　　　　　　　Break

Case 11:

printf (" haha \ n");

　　　　　　　　Break

Case :

printf (" hehe \ n");

　　　　　　　　Break

Case :

printf (" hehe \ n");

　　　　　　　　Break

}

}

printf ("You ' ve quit the dos\n");

}

0923 "Operating System Tutorial" experiment one · The programming of DOS command interpreter