How to specify inputs using scanf in a particular format

Hi,
I want to make a program that accepts the radius of a circle and co-ordinates of the center.
I want the user to specify the inputs as:
radius:{(x,y)}

eg, if the radius is 4, and center is at 1,2, then user should specify it as:
4:{(1,2)}

How to do this in C?

Code:

    scanf("%*c %*c %d %*c %d %*c %*c",'{','(',&x,',',&y,')','}');

In a format string, each character stands for itself, apart from %

So

Code:

scanf("%d:{(%d,%d)}", &r, &x, &y );

Originally Posted by Salem

In a format string, each character stands for itself, apart from %

So

Code:

scanf("%d:{(%d,%d)}", &r, &x, &y );

thanx for ur response but its not working!!
do u hv any other solution?

You really need to do better than bouncing back "It doesn't work".

Of course if works!

Code:

$ cat foo.c
#include<stdio.h>
int main ( int argc, char *argv[] ) {
    char message[] = "4:{(1,2)}";
    int x, y, r;
    if ( sscanf( message, "%d:{(%d,%d)}", &r, &x, &y) == 3 ) {
      printf("Qapla'!: %s parsed out %d %d %d\n", message, r, x, y);
    } else {
      printf("You have dishonoured the ways of C\n");
    }
    return 0;
}

$ gcc -Wall foo.c
$ ./a.out 
Qapla'!: 4:{(1,2)} parsed out 4 1 2

Now, YOU post what you actually tried, and what you actually typed in, and so on.

Actually i want user to provide the input.

Code:

printf("\nEnter the radius:");
scanf("%d",&r);
printf("\nEnter the coordinates of the center:");
scanf("%d%d",%x,%y);

Instead of this, i want user to enter like this:

Code:

printf("\nEnter the radius and the coordinates of the center: [r:{(x,y)}]
scanf(......);

what should i write in the scanf() so that the user on running the program, see the screen like this:

Code:

Enter the radius and the coordinates of the center: [r:{(x,y)}]
4:{(1,2)}      // user enters only 4,1,2. not :,{,(,),}

but i dont know how to do this. can u plz help me with this?

Code:

Enter the radius and the coordinates of the center: [r:{(x,y)}]
4:{(1,2)}      // user enters only 4,1,2. not :,{,(,),}

If the user only enters the numbers, where does the rest of the format come from?

If you want that level of cursor and display control, then you're going to have to use something like ncurses, or some other terminal control library for your OS/Compiler.

Standard ISO-C doesn't have anything which can do what you ask.

If you're still learning, you're making this needlessly complicated.

Originally Posted by adityamehta

Actually i want user to provide the input.

Code:

Enter the radius and the coordinates of the center: [r:{(x,y)}]
4:{(1,2)}      // user enters only 4,1,2. not :,{,(,),}

but i dont know how to do this. can u plz help me with this?

1) Stop changing your story... decide what the user has to type and program it...

2) If you just want the numbers use scanf("%d,%d,%d",&r,&x,&y); ... this would requre the user to type 10,5,2 and hit Enter.

This thread is a good example of why people hate scanf. Why do they hate it? Because they can't decide what format they really want, and they expect it to be some magical function that translates whatever random thing they decide to type at any given moment into what they really meant.


Quzah.