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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <stdbool.h>

/*******************************************************************/

int length_of_int(int n);
void output_padded_number(int number, int total_spaces, char pad_with);
void draw_menu(char * msg, char * options[], int length);
bool get_option(int length, int * option);

/*******************************************************************/

int main()
{
char * commands[] = {"DIR", "CHKDSK", "TIME", "DATE", "LABEL", "EXIT"};
int option;

while (1)
{
do
{
draw_menu("Prg. To Run DOS Commands", commands, 6);
} while (!get_option(6, &option));

if (option == 6)
{
break;
}
else
{
system(commands[option - 1]);
}
}
}

/*******************************************************************/

int length_of_int(int n)
{
if (n == 0)
{
return 1;
}
else
{
int length;
for (length = 1; n / (int)pow(10, length) > 0; length++) { }
return length;
}
}

void output_padded_number(int number, int total_spaces, char pad_with)
{
int width = length_of_int(number);
int padding_spaces = total_spaces - width;
int i;

for (i = 0; i < padding_spaces; i++)
{
printf("%c", pad_with);
}

printf("%d", number);
}

void draw_menu(char * msg, char * options[], int length)
{
int width_of_option_numbers = length_of_int(length);
int option_number;

printf("%s\n", msg);

for (option_number = 1; option_number <= length; option_number++)
{
output_padded_number(option_number, width_of_option_numbers, ' ');
printf(". %s\n", options[option_number - 1]);
}
}

bool get_option(int length, int * option)
{
int temp;
scanf("%d", &temp);

if (temp > 0 && temp <= length)
{
*option = temp;
return true;
}
else
{
return false;
}
}

Author:	alpesh [ Sat Oct 02, 2004 10:22 am ]
Post subject:	dos utility
turbo c++ ----------------- #include<stdio.h> #include<stdlib.h> #include<conio.h> void main() { char *command[]={ "DIR", "CHKDSK", "TIME", "DATE", "LABEL" }; char ch; for( ; ; ) { do { int i; clrscr(); printf("Prg. To Run DOS Commands\n"); printf("1.DIR\n"); printf("2.CHKDSK\n"); printf("3.TIME\n"); printf("4.DATE\n"); printf("5.LABEL\n"); printf("6.EXIT\n"); printf("\nchoice : "); ch=getche(); printf("\n"); } while((ch<'1') \|\| (ch>'6')); if(ch=='6') break; system(command[ch - '1']); } }

Author:	Dan [ Sat Oct 02, 2004 11:15 am ]
Post subject:
Wow that is some unportable code....thats only going to work on windows and even then on compliers that only let you do void main. Ushely it is a good idea to use int main so you can return an error code to the OS (witch in this case whould prity much have to be windows...). Edit: Also the way you are using that for loop is not realy that good progaming, i whould use a while or do loop in it's place.

Author:	JHanson90 [ Sat Oct 02, 2004 5:58 pm ]
Post subject:
alpesh, you might consider enclosing your source in [code] tags to make it appear correctly on the page, so it's more readable.

Author:	wtd [ Sat Oct 02, 2004 6:03 pm ]
Post subject:
As I noted in your other threa, but will note here again for emphasis, that is not C++ code, but rather C code. The two are quite different languages.