How To Use Scanf With Struct

03-04-2005

Hi, I am making a uncomplicated program that asks the user to input 2d points and the program will perform various functions.
This is what I have so far

Lawmaking:

#include <stdio.h>  struct point2D { 	float x; 	bladder y; };  int main() { 	point2D pa,atomic number 82;  	printf("Please enter the first point: "); 	scanf("%f" "%f", &pa.x, &pa.y); 	printf("Please enter the 2d indicate: ");  	return(0); }

When i enter the first point like so five 32
i get a runtime error and it says floating point is not loaded.
Am I using the structure wrong or is it the scanf?

Thanks

03-04-2005

You could always exercise a forum search for the bulletin, or peradventure look at what the first hit on a Google search gives yous.

Quzah.

03-04-2005

you need to declare insances of the structure. You have correctly created the construction, but need instances.

And then....

Code:

struct point2d pa; struct point2d lead;

yous can so remove the line
Also change the

Code:

scanf("%f" "%f".......

to

Code:

scanf("%f %f"......

03-04-2005

Really, no you don't have to. 2 string literals volition be concatenated into a single literal at compile time. Furthermore, they take alleged an example of their structure, or at least if they're compiling as C++ they have:

Code:

struct point2D { 	float x; 	float y; };  int main() {                        point2D pa,lead;

In C they need to just add the keyword struct to the beginning of that line.

Neither of these issues are really what they're posting about however.

Quzah.

03-04-2005

I stand corrected..... however if this is c++ and so surely the bulletin should exist posted in the c++ forum??

So are you maxim that

scanf("%f""%f", &var1, &var2);

is accepted? ok... just tested and it is, but nonetheless, it seems like bad practice to put this...

therefore the code should exist (if C ):

Lawmaking:

#include <stdio.h>  struct point2D { 	bladder x; 	float y; };  int main() { 	struct point2D pa,pb;  	printf("Please enter the first point: "); 	scanf("%f" "%f", &pa.ten, &pa.y); 	printf("Delight enter the 2nd point: "); 	 	system("pause");  	return(0); }

03-04-2005

Sure, it should be compiled as C. However, since they didn't say they were getting any other errors, such as:

suchas.c: In office `master':
suchas.c:11: error: `point2D' undeclared (kickoff apply in this role)
suchas.c:eleven: error: (Each undeclared identifier is reported only once
suchas.c:xi: error: for each function information technology appears in.)
suchas.c:11: error: parse error before "pa"
suchas.c:14: fault: `pa' undeclared (first use in this function)

And so it'southward obvious they're compiling as C++ and not C.

But again, that has nix to do with their floating bespeak problem.

Quzah.

03-04-2005

this form seem clearer to me.

Lawmaking:

#include <stdio.h>  typedef struct  { 	float x; 	float y; }point2D;  int main() { 	point2D pa;  	printf("Please enter the first point: "); 	scanf("%f" "%f", &pa.ten, &pa.y); 	printf("Please enter the second point: "); 	 	system("pause");  	return(0); }

yet, it gives same runtime error .