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.

three , experimental environment

1. PC Microcomputer

2. Windows Operating System

3. A/C + + program Development Integration Environment

Four, the experiment principle and core algorithm reference program segment

Select with a while statement and then nest using If,else if. When the command is entered, the command will be interpreted, input the help view command prompt, enter quit program. Use the strcmp comparison function, such as strcmp (Str,cmd[0]) ==0, compared to the previous array, the same is 0, and the difference is 1. 0 o'clock implements the output.

#include <stdio.h>
#include <stdlib.h>
# include<string.h>
Main ()
{
Char cmd[30][30]={"dir", "CD", "MD", "RD", "CLS", "Date", "Time", "Ren", "Copy", "Quit", "help"};
Char str[10];

int i;

while (1) {

printf ("Please enter the prompt:>");
Gets (str);


for (i=0;i<20;i++) {

{

if (strcmp (str,cmd[0]) ==0)
{
printf ("type: internal command \ n");
printf ("View current directory \ n");
printf ("\ n");
printf ("\ n");
Break
}
else if (strcmp (str,cmd[1]) ==0)
{
printf ("type: internal command \ n");
printf ("Show the name of the current directory \ n");
printf ("\ n");
printf ("\ n");
Break
}
else if (strcmp (str,cmd[2]) ==0)
{
printf ("type: internal command \ n");
printf ("Create a new directory \ n");
printf ("\ n");
printf ("\ n");
Break
}
else if (strcmp (str,cmd[3]) ==0)
{
printf ("type: internal command \ n");
printf ("Delete this directory ... \ n");
printf ("\ n");
printf ("\ n");
Break
}
else if (strcmp (str,cmd[4]) ==0)
{

printf ("type: internal command \ n");
printf ("Clear screen \ n");

printf ("\ n");
printf ("\ n");
Break
}
else if (strcmp (str,cmd[5]) ==0)
{
printf ("type: internal command \ n");
printf ("Show or set date??? \ n ");
printf ("\ n");
printf ("\ n");
Break
}
else if (strcmp (str,cmd[6]) ==0)
{
printf ("type: internal command \ n");
printf ("Show or set system time \ n");
printf ("\ n");
printf ("\ n");
Break
}
else if (strcmp (str,cmd[7]) ==0)
{
printf ("type: internal command \ n");
printf ("Rename file \ n");
printf ("\ n");
printf ("\ n");
Break
}
else if (strcmp (str,cmd[8]) ==0)
{
printf ("type: internal command \ n");
printf ("Copy at least one file to another location \ n");
printf ("\ n");
printf ("\ n");
Break
}
else if (strcmp (str,cmd[9]) ==0)
{
return 0;

}
}

}
}
}

Programming of a DOS command interpreter