Command interpreter experiment

I. Purpose and Requirements

1. Purpose of the experiment

(1) Master the Principle of command interpretation procedure;

(2) Master the simple Dos call method;

(3) 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 task assigned by the teacher, the design, coding and testing work is done.

three . 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 () {CharCMD [ -][ -]={"dir","CD","MD","Rd","Date"," Time","CLS","Ren",        "Copy"," Help","quit"}; Charstr[ -];  while(1) {printf ("Enter a display character");        Gets (str); if(strcmp (str,cmd[0])==0) {printf ("dir indicates no parameters: View the File box folder for the current directory \ n"); }        Else if(strcmp (str,cmd[1])==0) {printf ("CD Directory Name: Enter a specific folder. \ n"); }        Else if(strcmp (str,cmd[2])==0) {printf ("MD Directory Name: Create a specific folder. \ n"); }        Else if(strcmp (str,cmd[3])==0) {printf ("Rd Directory Name: Deletes a specific folder. \ n"); }        Else if(strcmp (str,cmd[4])==0) {printf ("CLS Directory Name: Indicates the clear screen function. \ n"); }             Else if(strcmp (str,cmd[5])==0) {printf ("Data Directory Name: set date. \ n"); }             Else if(strcmp (str,cmd[6])==0) {printf ("Time Directory Name: Set the times. \ n"); }             Else if(strcmp (str,cmd[7])==0) {printf ("ren directory name: Indicates that the file was changed to a name. \ n"); }             Else if(strcmp (str,cmd[8])==0) {printf ("Copy directory Name: Represents the Copy command. \ n"); }             Else if(strcmp (str,cmd[9])==0) {printf ("CD Directory Name: Enter a specific directory. \ n"); printf ("MD Directory Name: Create a specific directory. \ n"); printf ("dir indicates no parameters: View the File box folder for the current directory \ n"); printf ("Rd Directory Name: Deletes a specific folder. \ n"); printf ("CLS Directory Name: Indicates the clear screen function. \ n"); printf ("Data Directory Name: set date. \ n"); printf ("Time Directory Name: Set the times. \ n"); printf ("ren directory name: Indicates that the file was changed to a name. \ n"); printf ("Copy directory Name: Represents the Copy command. \ n"); }             Else if(strcmp (str,cmd[Ten])==0)         {             return; }         Else{printf ("you entered the wrong information, please re-enter \ n"); }    }}

Five Run results

Vi. Summary

This experiment is not difficult according to reason, but start writing, what all forget, freshman learned basically forget the light, so in writing procedures need to ask degrees Niang. Just like some identifiers forget the meaning, there are some normative errors in writing and so on.

Command interpreter experiment