Writing to Text Files

DesperateCry · #1 12-Apr-2005, 20:43

I need to find if two lines formed from the points i read from a text file intersects and write the intersected points number, x,y coordinates back to the same file. So far still no luck... I neither could get the x, y found in kesisim function to main function, nor write them right into the file at the function.. At the last try, i got a file of some megabytes...

CPP / C++ / C Code:

#include <stdio.h>


float kesisim(float a, float b, float c, float d, float e, float f, float g, float h, int sira)
{
        
        float i,j,k,l,m,n;
        FILE* fp;
        i = d - b;                         //30
        j = c - a;
        k = i / j;
        l = h - f;
        m = g - e;
        n = l / m;                   //35
    printf("dogru icinde\n");
        if ( a == c && a == e && e == g )
           printf("Tüm noktalar ayni dogru üzerindedir\n");
        else if ( b == d && b == f && f == h )
           printf("Tüm noktalar ayni dogru üzerindedir\n");     //40
        else if ( k != n )
        {
           float A, B, C, D, E, F, G, x, y;          //43
           A = b - d;
           B = c - a;
           C = A*a+B*b;
           E = f - h;
           F = g - e;                      //48
           G = E*e+F*f;
           D = A*F - E*B;
           x = ( F*C - B*G )/D;
           y = ( A*G - E*C )/D;
           printf("Dogrular x = %f, y = %f noktasinda kesisirler\n", x, y);
           fp = fopen("deneme.txt","w");    //70
           while(!feof(fp))
           {
            fprintf(fp,"%d %f %f\n", sira, x, y);
           }
        }
        else
        printf("Dogrular Kesismez\n");
        fclose(fp);
        return 0;    
}

                                          //60
int main()
  
{

  int    n[100];
  float  x[100];
  float  y[100];      //65
  FILE* fp;
  int indis,no,v,w,p,z;
  int no1, no2, no3, no4;
  float o1, o2;
  int o,q;
  o = 0;
  fp = fopen("deneme.txt","r");    //70

  while(!feof(fp))
    {

    printf("#%d\n",o);            //75
    fscanf(fp,"%d",&n[o]);
fscanf(fp,"%f",&x[o]);
fscanf(fp,"%f\n",&y[o]);

    printf("Point %d: %f,%f\n",n[o],x[o],y[o]);
    o++;
    
    }                  //80
  
  printf("%f\n", x[9]);
  printf("Enter 4 points by numbers\n");
  scanf("%d %d %d %d\n", &no1,&no2,&no3,&no4);
  fclose(fp);
  q=o+1;
  kesisim(x[no1], y[no1], x[no2], y[no2], x[no3], y[no3],x[no4],y[no4],q);
  return 0;                //85
}

WaltP · #2 13-Apr-2005, 01:19

Quote:

Originally Posted by DesperateCry

I need to find if two lines formed from the points i read from a text file intersects and write the intersected points number, x,y coordinates back to the same file. So far still no luck... I neither could get the x, y found in kesisim function to main function, nor write them right into the file at the function.. At the last try, i got a file of some megabytes...

You might want to tell us what happened and what you expected to happen. Your description gives us no clue other than "it don't work right". Also, use two different files during testing so you don't have to recreate the input file all the time.

DesperateCry · #3 19-Apr-2005, 08:09

Quote:

Originally Posted by WaltP

You might want to tell us what happened and what you expected to happen. Your description gives us no clue other than "it don't work right". Also, use two different files during testing so you don't have to recreate the input file all the time.

Sorry, i was able to solve the problems afterwards. Now that reads the point numbers, x,y coordinates from a file, let you choose four points by numbers, form two lines from them and write down the intersection point (if there is) in the same file. Currently working on some details, like entering same numbers, entered point number not existing in the file to be read, giving number to the new point to be written.. Indis is belong to these details, well after i will write down them

CPP / C++ / C Code:

#include <stdio.h>


float kesisim(float a, float b, float c, float d, float e, float f, float g, float h, float sira)
{
        
        float i,j,k,l,m,n;
        FILE* fs;
        i = d - b;                         //30
        j = c - a;
        k = i / j;
        l = h - f;
        m = g - e;
        n = l / m;                   //35
        if ( a == c && a == e && e == g )
           printf("Points are on the same line\n");
        else if ( b == d && b == f && f == h )
           printf("Points are on the same line\n");     //40
        else if ( k != n )
        {
           float A, B, C, D, E, F, G, x, y;          //43
           A = b - d;
           B = c - a;
           C = A*a+B*b;
           E = f - h;
           F = g - e;                      //48
           G = E*e+F*f;
           D = A*F - E*B;
           x = ( F*C - B*G )/D;
           y = ( A*G - E*C )/D;
           printf("Lines intersect at x = %f, y = %f\n", x, y);
           fs = fopen("deneme.txt","a");    //70
           {
            fprintf(fs,"%f %f %f", sira, x, y);
           }
        fclose(fs);
        }
        else
        printf("Lines does not intersect\n");
     
        return 0;    
}

                                          //60
int main()
  
{

  int    n[100];
  float  x[100];
  float  y[100];      //65
  FILE* fp;
  int indis,no,v,w,p,z;
  int no1, no2, no3, no4;
  float o1, o2;
  int o,q;
  o = 0;
  fp = fopen("deneme.txt","r");    //70
  while(!feof(fp))
    {

    printf("#%d\n",o);            //75
    fscanf(fp,"%d",&n[o]);
fscanf(fp,"%f",&x[o]);
fscanf(fp,"%f\n",&y[o]);

    printf("Point %d: %f,%f\n",n[o],x[o],y[o]);
    o++;
    
    }                  //80
 
  printf("%f\n", x[9]);
  do{
  printf("Enter 4 points by numbers\n");
  scanf("%d %d %d %d", &no1,&no2,&no3,&no4);
  }while(no1==no2 || no1==no3 || no1==no4 || no2==no3 || no2==no4 || no3==no4);
  if(no1==n[q])
  indis=q;
  printf("%d\n", q);
  fclose(fp);
  kesisim(x[no1], y[no1], x[no2], y[no2], x[no3], y[no3],x[no4],y[no4],o);
  return 0;                //85
}

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