program looping with final output

**hebali** · 02-26-2008

Hi,
So I currently have the following.
But it does not work because I have not set up the array of forcevertex[j] properly.
How do I work that?
Thanks

Code:

#include <iostream>

int main (void) {

    
/* Variables */
	float Xreal; 
	float Yreal; 
	float Zreal;
	float Xforce;
	float Yforce;
	float Zforce;
	float Tval;
	char inZforce[64];
	
	int check_input;
	char input_buffer[160];
	
	int wloop = 8;
	int j; /* vertex number */
	
	char forcevertex0[300];
	char forcevertex1[300];
	char forcevertex2[300];
	char forcevertex3[300];
	char forcevertex4[300];
	char forcevertex5[300];
	char forcevertex6[300];
	char forcevertex7[300];

	
/* Prompts */
	
/* Loop */
	for(wloop = 7; wloop >= 0; wloop--)
	{
	
	/* Set vertex-number for loop pass */
	j=8-wloop;
	
	/* Get coordinates of real */
	printf("Real-Point values in (x, y, z) ");
	fgets(input_buffer, sizeof input_buffer, stdin);
	check_input = sscanf(input_buffer, "(&#37;f,%f,%f)", &Xreal, &Yreal, &Zreal);
	while (check_input !=3) {
		//Improper format
		printf("Improper format.");
		return(0);
	};
	
	
	
	/* Get Z coordinate of forced */
	printf("Zforce value: ");
	fgets(inZforce, sizeof inZforce, stdin);
	Zforce=strtof(inZforce, NULL);
	
	
/* Computation */
	Tval=Zforce/Zreal;
	Xforce=Tval*Xreal;
	Yforce=Tval*Yreal;
	
/* Output Display */
	printf(" \n");
	printf("Forced Point: (%.3f, %.3f, %.3f) \n",Xforce,Yforce,Zforce);
	printf("Real Point:   (%.3f, %.3f, %.3f) \n",Xreal,Yreal,Zreal);
	printf("T-value: %.3f \n",Tval);
	printf(" \n");

/* Save vertex information before going to next one */
	forcevertex[j]=("Vertex %i: Forced: (%.3f, %.3f, %.3f) Real: (%.3f, %.3f, %.3f) \n",j,Xforce,Yforce,Zforce,Xreal,Yreal,Zreal);
	
	} /* End Loop */

	
/* Final Display */	
	printf("Vertex creation complete. \n");
	/* Then display Force-Vertex 0-7 coords */
	printf("%s \n",forcevertex0);
	printf("%s \n",forcevertex1);
	printf("%s \n",forcevertex2);
	printf("%s \n",forcevertex3);
	printf("%s \n",forcevertex4);
	printf("%s \n",forcevertex5);
	printf("%s \n",forcevertex6);
	printf("%s \n",forcevertex7);
	
	return(0);
}

**hebali** · 02-26-2008

Sorry, to include the code again.
I'm trying to figure out how the arrays will work here but am having a problem
because when I define the variable forcevertex[]
I need it to be a char string containing the following information:

Code:

forcevertex[j]=("Vertex &#37;i: Forced: (%.3f, %.3f, %.3f) Real: (%.3f, %.3f, %.3f) \n",j,Xforce,Yforce,Zforce,Xreal,Yreal,Zreal);

But if I define the variable char forcevertex[8], trying to account for the 8 vertices that will be created, the program will interpret the 8 as the string length rather than the array.

So, I'm confused.

Help please?

Thanks so much.

Code:

#include <iostream>

int main (void) {

    
/* Variables */
	float Xreal; 
	float Yreal; 
	float Zreal;
	float Xforce;
	float Yforce;
	float Zforce;
	float Tval;
	char inZforce[64];
	
	int check_input;
	char input_buffer[160];
	
	int wloop = 8;
	int j; /* vertex number */
	
	char forcevertex[8];


	
/* Prompts */
	
/* Loop */
	for(wloop = 7; wloop >= 0; wloop--)
	{
	
	/* Set vertex-number for loop pass */
	j=8-wloop;
	
	/* Get coordinates of real point */
	printf("Real-Point values in (x, y, z) ");
	fgets(input_buffer, sizeof input_buffer, stdin);
	check_input = sscanf(input_buffer, "(%f,%f,%f)", &Xreal, &Yreal, &Zreal);
	while (check_input !=3) {
		//Improper format
		printf("Improper format.");
		return(0);
	};
	
	
	
	/* Get Z coordinate of forced point */
	printf("Zforce value: ");
	fgets(inZforce, sizeof inZforce, stdin);
	Zforce=strtof(inZforce, NULL);
	
	
/* Computation */
	Tval=Zforce/Zreal;
	Xforce=Tval*Xreal;
	Yforce=Tval*Yreal;
	
/* Output Display */
	printf(" \n");
	printf("Forced Point: (%.3f, %.3f, %.3f) \n",Xforce,Yforce,Zforce);
	printf("Real Point:   (%.3f, %.3f, %.3f) \n",Xreal,Yreal,Zreal);
	printf("T-value: %.3f \n",Tval);
	printf(" \n");

/* Save vertex information before going to next one */
	forcevertex[j]=("Vertex %i: Forced: (%.3f, %.3f, %.3f) Real: (%.3f, %.3f, %.3f) \n",j,Xforce,Yforce,Zforce,Xreal,Yreal,Zreal);
	
	} /* End Loop */

	
/* Final Display */	
	printf("Vertex creation complete. \n");
	/* Then display Force-Vertex 0-7 coords */
	printf("%s \n",forcevertex[0]);
	printf("%s \n",forcevertex[1]);
	printf("%s \n",forcevertex[2]);
	printf("%s \n",forcevertex[3]);
	printf("%s \n",forcevertex[4]);
	printf("%s \n",forcevertex[5]);
	printf("%s \n",forcevertex[6]);
	printf("%s \n",forcevertex[7]);
	
	return(0);
}

**hebali** · 02-26-2008

Perhaps I need to introduce a pointer?

**vart** · 02-26-2008

1. #include <stdio.h>
<iostream> is for C++

2.
use struct

Code:

struct  vertex
{
	float Xreal; 
	float Yreal; 
	float Zreal;
	float Xforce;
	float Yforce;
	float Zforce;
	float Tval;
};

3. Define array of structs

Code:

struct  vertex data[8];

in a loop initialize the corresponding element of the array

Code:

for(j=0;j<8;j++)
{
...
   check_input = sscanf(input_buffer, "(&#37;f,%f,%f)", &data[j].Xreal, &data[j].Yreal, &data[j].Zreal);

...
}

After the loop is complited use another loop to print data

Code:

for(j=0;j<8;j++)
{
   printf("Vertex %i: Forced: (%.3f, %.3f, %.3f) Real: (%.3f, %.3f, %.3f) \n",
      j,data[j].Xforce,data[j].Yforce,data[j].Zforce,data[j].Xreal,data[j].Yreal,data[j].Zreal);	
}

**hebali** · 02-26-2008

Hi, thanks.
But I'm not sure if I understood where the j loop is placed. In the code below, an error occurs that "Xreal, Yreal, Zreal, etc were not defined in this scope"

What is wrong with this?

Code:

#include <stdio.h>

int main (void) {

    
/* Variables */
struct vertex
{
	float Xreal; 
	float Yreal; 
	float Zreal;
	float Xforce;
	float Yforce;
	float Zforce;
	float Tval;
};	
	
	char inZforce[64];
	
	int check_input;
	char input_buffer[160];
	
	int wloop = 8;
	int j; /* vertex number */
	
	char forcevertex[8];

/* Define struct array */
	struct vertex data[8];

	
/* Prompts */
	
	j=8-wloop;
	
	/* Set vertex-number for loop pass */
	for(j=0;j<8;j++)
	{

	
/* Loop */
	for(wloop = 7; wloop >= 0; wloop--)
	{
	
	/* Get coordinates of real point */
	printf("Real-Point values in (x, y, z) ");
	fgets(input_buffer, sizeof input_buffer, stdin);
	check_input = sscanf(input_buffer, "(&#37;f,%f,%f)", &Xreal, &Yreal, &Zreal);
	while (check_input !=3) {
		//Improper format
		printf("Improper format.");
		return(0);
	};
	
	
	
	/* Get Z coordinate of forced point */
	printf("Zforce value: ");
	fgets(inZforce, sizeof inZforce, stdin);
	Zforce=strtof(inZforce, NULL);
	
	
/* Computation */
	Tval=Zforce/Zreal;
	Xforce=Tval*Xreal;
	Yforce=Tval*Yreal;
	
/* Output Display */
	printf(" \n");
	printf("Forced Point: (%.3f, %.3f, %.3f) \n",Xforce,Yforce,Zforce);
	printf("Real Point:   (%.3f, %.3f, %.3f) \n",Xreal,Yreal,Zreal);
	printf("T-value: %.3f \n",Tval);
	printf(" \n");

/* Save vertex information before going to next one */
	forcevertex[j]=("Vertex %i: Forced: (%.3f, %.3f, %.3f) Real: (%.3f, %.3f, %.3f) \n",j,Xforce,Yforce,Zforce,Xreal,Yreal,Zreal);
	
	} /* End Loop */
}
	
/* Final Display */	
	printf("Vertex creation complete. \n");
	/* Then display Force-Vertex 0-7 coords */
	for(j=0;j<8;j++)
	{
	printf("Vertex %i: Forced: (%.3f, %.3f, %.3f) Real: (%.3f, %.3f, %.3f) \n",j,data[j].Xforce,data[j].Yforce,data[j].Zforce,data[j].Xreal,data[j].Yreal,data[j].Zreal,data[j]);
	}
	
	return(0);
}

**hebali** · 02-26-2008

Sorry, I fixed

Code:

check_input = sscanf(input_buffer, "(&#37;f,%f,%f)", &Xreal, &Yreal, &Zreal);

to instead be

Code:

check_input = sscanf(input_buffer, "(%f,%f,%f)", &data[j].Xreal, &data[j].Yreal, &data[j].Zreal);

but now
zforce, strtof, Tval, Zreal, Xforce, Xreal, Yforce, Yreal
are still not "declared in this scope"

why is strtof a part of that?

**vart** · 02-26-2008

Code:

#include <stdio.h>
#include <stdlib.h> /* for strtod */

/* Data type definition */
struct vertex
{
	float Xreal; 
	float Yreal; 
	float Zreal;
	float Xforce;
	float Yforce;
	float Zforce;
	float Tval;
};	

int main (void) {
	
    
	/* Variables */
	char inZforce[64];
	int check_input;
	char input_buffer[160];
	int j; /* vertex number */
	
	/* struct array */
	struct vertex data[8];
	
	
	/* Prompts */
	/* Set vertex-number for loop pass */
	for(j=0;j<8;j++)
	{
		
		/* Get coordinates of real point */
		printf("Real-Point values in (x, y, z) ");
		fgets(input_buffer, sizeof input_buffer, stdin);
		check_input = sscanf(input_buffer, "(&#37;f,%f,%f)", 
			&data[j].Xreal, &data[j].Yreal, &data[j].Zreal);
		
		while (check_input !=3) {
			//Improper format
			printf("Improper format.");
			return(0);
		};
		
		
		
		/* Get Z coordinate of forced point */
		printf("Zforce value: ");
		fgets(inZforce, sizeof inZforce, stdin);
		data[j].Zforce=(float)strtod(inZforce, NULL);
		
		
		/* Computation */
		data[j].Tval=data[j].Zforce/data[j].Zreal;
		data[j].Xforce=data[j].Tval*data[j].Xreal;
		data[j].Yforce=data[j].Tval*data[j].Yreal;
		
		/* Output Display */
		printf(" \n");
		printf("Forced Point: (%.3f, %.3f, %.3f) \n",
			data[j].Xforce,data[j].Yforce,data[j].Zforce);
		printf("Real Point:   (%.3f, %.3f, %.3f) \n",
			data[j].Xreal,data[j].Yreal,data[j].Zreal);
		printf("T-value: %.3f \n",
			data[j].Tval);
		printf(" \n");
		
	} /* End Loop */
	
	/* Final Display */	
	printf("Vertex creation complete. \n");
	/* Then display Force-Vertex 0-7 coords */
	for(j=0;j<8;j++)
	{
		printf("Vertex %i: Forced: (%.3f, %.3f, %.3f) Real: (%.3f, %.3f, %.3f) \n",
			j,
			data[j].Xforce,data[j].Yforce,data[j].Zforce,
			data[j].Xreal,data[j].Yreal,data[j].Zreal);
	}
	
	return(0);
}

Pay attention to the diferencies

**hebali** · 02-26-2008

vart,
your approach was perfect and I now am beginning to understand the idea. Thanks so much!

**slingerland3g** · 02-26-2008

Just check user input more thoroughly.

Real-Point values in (x, y, z) (2.3,4.5,6.a)
Zforce value: 2.D

Forced Point: (0.767, 1.500, 2.000)
Real Point: (2.300, 4.500, 6.000)
T-value: 0.333

Real-Point values in (x, y, z) (2.3,4.5,6.a)
Zforce value: D.2

Forced Point: (0.000, 0.000, 0.000)
Real Point: (2.300, 4.500, 6.000)
T-value: 0.000

Real-Point values in (x, y, z)
Improper format.

**hebali** · 02-28-2008

slinger,
how do you mean exactly?
for right now im satisfied if the program works for correctly formatted inputs because this is sorta an intermediate stage, eventually i will be cutting out the middle man of a user to have the computer provide inputs from another element of the program. but I would like to know how I can have the program check the format nonetheless.

thanks

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