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>
Main ()
{
Char cmd[20][20]={"dir", "CD", "MD", "RD", "CLS", "Date", "Time", "Ren", "Copy", "Help", "quit"};
Char str[20];
while (1)
{
printf ("Please enter the indicator");
Gets (str);
if (strcmp (str,cmd[0]) ==0)
{
printf ("dir means no parameters: View the text and folder of the current directory \ n");
}
else if (strcmp (str,cmd[1]) ==0)
{
printf ("CD directory name: Enter a specific directory \ n");
}
else if (strcmp (str,cmd[2]) ==0)
{
printf ("MD Directory name: Establish a specific folder, DOS under the habit called Directory, win under the habit of calling folder \ n");
}
else if (strcmp (str,cmd[3]) ==0)
{
printf ("Rd Directory name: delete a specific folder \ n");
}
else if (strcmp (str,cmd[4]) ==0)
{
printf ("CLS clears screen \ n");
}
else if (strcmp (str,cmd[5]) ==0)
{
printf ("Data set date command, function is set date \ n");
}
else if (strcmp (str,cmd[6]) ==0)
{
printf ("Time system clock Settings command, function: Set or display system period. \ n");
}
else if (strcmp (str,cmd[7]) ==0)
{
printf ("Ren" means that the file changed to a name, the format of the Ren command is: The file name of the ren source filename \ n ");
}
else if (strcmp (str,cmd[8]) ==0)
{
printf ("Copy means copy command, copy a file to another place \ n");
}
else if (strcmp (str,cmd[9]) ==0)
{
printf ("dir means no parameters: View the text and folder of the current directory \ n");

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

printf ("MD Directory name: Establish a specific folder, DOS under the habit called Directory, win under the habit of calling folder \ n");

printf ("Rd Directory name: delete a specific folder \ n");

printf ("CLS clears screen \ n");

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

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

printf ("Ren" means that the file changed to a name, the format of the Ren command is: The file name of the ren source filename \ n ");

printf ("Copy means copy command, copy a file to another place \ n");
}
else if (strcmp (str,cmd[10]) ==0)
Return
Else
{
printf ("You enter the wrong information, please re-enter: \ n");
}
}

}

Analysis of experimental results

1. Enter one of the commands

2. Enter Help to display all commands

3. Input error Instructions

4. Enter quit to close the program directly

V. Summary of the Experiment

Through this experiment, is to review a C language, the function is relatively simple, through while loop implementation, but still need to learn more knowledge.

Programming of a DOS command interpreter