--- Debasish Deka <[EMAIL PROTECTED]> wrote:
> Hello,
> Wonder why some peole posts questions without
> even making a google
> search.
> 'system()' is a library function that executes any
> shell command passed to
> it as a string.
> In the present context as Rick told it waits for the
> user to press any key
> before the output shell / command prompt closes.
> This ' system("PAUSE") ' is used generally in GCC
> compilers.
> Regards,
> Debasish
>
> ----Original Message Follows----
> From: Rick <[EMAIL PROTECTED]>
> Reply-To: [email protected]
> To: [email protected]
> Subject: Re: [c-prog] can u solve this problem?
> Date: Wed, 17 Jan 2007 09:38:42 -0500
>
> If you double-click the program, it will run but the
> window will close
> before you get a chance to see the results. The
> pause lets you view the
> results before closing the window. The PAUSE isn't
> really needed. It simply
> prints a message and waits for a response so the
> command prompt does not
> close.
>
> And, I didn't look close enough at the original
> program. The memory for str
> should be allocated before it is used.
>
> ~Rick
>
> At 1/16/2007 09:46 PM, you wrote:
> >Hi Rick,
> >
> > Nice snippet !!! But, what is the use
> of system("PAUSE");
> >in your program ?
> >
> >Cheers,
> >Murali
> >
> >
> >----- Original Message ----
> >From: Rick <[EMAIL PROTECTED]>
> >To: [email protected]
> >Sent: Wednesday, 17 January, 2007 4:16:47 AM
> >Subject: Re: [c-prog] can u solve this problem?
> >
> >At 1/16/2007 04:01 PM, you wrote:
> >>Hi
> >>
> >>I want to write a program that reads a string s
> then sums the number
> >>assciated to each string in teh alphabet like the
> following schema:
> >>a=1,b=2,c=3, d=4,e=5,f= 6,g=7,h=8, i=9,j=10,
> k=20,l=30, m=40,n=50,
> >>o=60,p=70,
> >>q=80,r=90,s= 100,t=200, u=300,v=400, w=500,x=600,
> y=700,z=800.
> >>
> >>I wrote the following program for the first 10
> characters of the schema.
> >>But it didn't work properly.
> >>
> >>can u fix it?
> >>
> >>Here is the program:
> >>============ ====
> >>
> >>
> >>int main(int argc, char *argv[])
> >>{
> >> char *s;
> >> int *t,n,a=0,i;
> >>
> >> cout << "Enter a string";
> >> cin >> s ;
> >> n=strlen(s);
> >> for (i=0;i<n;i++)
> >> {
> >> switch(s[i])
> >> {
> >> case 'a':
> >> {a=a+1;
> >> t[1]=a;}
> >>
> >> case 'b':
> >> {a=a+1;
> >> t[2]=a;}
> >>
> >> case 'c':
> >> {a=a+1;
> >> t[3]=a;}
> >> case 'd':
> >> {a=a+1;
> >> t[4]=a;}
> >> case 'e':
> >> {a=a+1;
> >> t[5]=a;}
> >> case 'f':
> >> {a=a+1;
> >> t[6]=a;}
> >> case 'g':
> >> {a=a+1;
> >> t[7]=a;}
> >> case 'h':
> >> {a=a+1;
> >> t[8]=a;}
> >> case 'i':
> >> {a=a+1;
> >> t[9]=a;}
> >> case 'j':
> >> {a=a+1;
> >> t[10]=a;}
> >>
> >>
> >> }
> >> a=a+t[i];
> >>
> >> }
> >> cout << "the length is " << a;
> >> system("PAUSE");
> >> return 0;
> >>}
> >>
> >>
> >>Mohammed
> >
> >I'm not the best programmer around, but I would not
> use a switch statement.
> >I would do something like this:
> >
> >#include <cstdlib>
> >#include <iostream>
> >
> >using namespace std;
> >
> >// Add each letter in the supplied string using the
> following values:
> >
> >// a=1,b=2,c=3, d=4,e=5,f= 6,g=7,h=8, i=9,j=10,
> k=20,l=30, m=40,n=50,
> >o=60,p=70,
> >// q=80,r=90,s= 100,t=200, u=300,v=400,
> w=500,x=600, y=700,z=800.
> >
> >int main(int argc, char *argv[])
> >{
> >
> > char *str;
> > int val;
> > int idx;
> > int num;
> > int tmp;
> > int values[26] = {1,2,3,4,5,6, 7,8,9,10,
> 20,30,40, 50,60,70, 80,90,100,
> >200,300,400, 500,600,700, 800};
> >
> > cout << "Enter a string: ";
> > cin >> str;
> > num=strlen(str) ;
> > for (val=idx=0;idx<num;idx++)
> > {
> > tmp = str[idx]-'a' ;
> > val += values[tmp];
> > }
> > cout << "The sum is " << val << endl;
> >
> > system("PAUSE");
> > return EXIT_SUCCESS;
> >}
> >
> >~Rick
> >
The question wasn't what does system("PAUSE"); do, but
why was it used in the program. If you execute the
program from the command line, the system("PAUSE"); is
extraneous.
Ray
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