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  1. #include <iostream>
  2. #include <time.h>
  3. #include <cstdlib>
  4. #include <math.h>
  5. #include <stdio.h>
  6. using namespace std;
  7.  
  8. struct NVec
  9. {
  10.     int coord[99];
  11. };
  12. struct NVec initialize (int N)
  13. {
  14.     struct NVec temp;
  15.     for(int i=0; i<N; i++)
  16.         temp.coord[i]=rand()%100+1;
  17.     return temp;
  18. }
  19. struct NVec addition (struct NVec V1, struct NVec V2, int N)
  20. {
  21.     struct NVec temp;
  22.     for(int i=0; i<N; i++)
  23.         temp.coord[i]=V1.coord[i]+V2.coord[i];
  24.     return temp;
  25. }
  26. struct NVec subtraction (struct NVec V1, struct NVec V2, int N)
  27. {
  28.     struct NVec temp;
  29.     for(int i=0; i<N; i++)
  30.         temp.coord[i]=V1.coord[i]-V2.coord[i];
  31.     return temp;
  32. }
  33. int scalarMultiplication (struct NVec V1, struct NVec V2, int N)
  34. {
  35.     int outcome=0;
  36.     for(int i=0; i<N; i++)
  37.         outcome+=V1.coord[i]*V2.coord[i];
  38.     return outcome;
  39. }
  40. double length (struct NVec V1, int N)
  41. {
  42.     double l=0;
  43.     for(int i=0; i<N; i++)
  44.         l+=pow(V1.coord[i],2);
  45.     return sqrt(l);
  46. }
  47. void CompareVectors(struct NVec *V)
  48. {
  49.     FILE *file;
  50.     if((file=fopen("vectorCmp.txt", "w"))==NULL)
  51.     {
  52.         cout<<"Couldn't open the file!";
  53.         exit(1);
  54.     }
  55.     for(int i=0; i<100; i+=2)
  56.     {
  57.         struct NVec temp;
  58.         for(int j=0; j<2; j++)
  59.         {
  60.             fprintf(file,"[%d]",V[i].coord[j]);
  61.         }
  62.         fprintf(file,"\t");
  63.         for(int j=0; j<2; j++)
  64.         {
  65.             fprintf(file,"[%d]",V[i+1].coord[j]);
  66.         }
  67.         fprintf(file,"\nAddition:");
  68.         temp=addition(V[i],V[i+1],2);
  69.         for(int j=0; j<2; j++)
  70.         {
  71.             fprintf(file,"[%d]",temp.coord[j]);
  72.         }
  73.  
  74.         temp=subtraction(V[i],V[i+1],2);
  75.         fprintf(file,"\nSubtraction:");
  76.         for(int j=0; j<2; j++)
  77.         {
  78.             fprintf(file,"[%d]",temp.coord[j]);
  79.         }
  80.         int ScalarMult=scalarMultiplication(V[i],V[i+1],2);
  81.         fprintf(file,"\nScalar multiplication:");
  82.         fprintf(file,"[%d]",ScalarMult);
  83.         fprintf(file,"\nV1 length:%lf\tV2 length:%lf\n",length(V[i],2),length(V[i+1],2));
  84.     }
  85.     fclose(file);
  86. }
  87. void SaveVectors(struct NVec *V, int N)
  88. {
  89.     FILE *file;
  90.     file=fopen("vector.txt", "w");
  91.     for(int i=0;i<100;i++)
  92.     {
  93.         for(int j=0;j<N;j++)
  94.         fprintf(file,"[%d] ",V[i].coord[j]);
  95.         fprintf(file,"\n");
  96.     }
  97.     fclose(file);
  98. }
  99. int main()
  100. {
  101.     srand(time(NULL));
  102.     struct NVec V[100];
  103.     struct NVec X[100];
  104.     for(int i=0; i<100; i++)
  105.         V[i]=initialize(2);
  106.     CompareVectors(V);
  107.     SaveVectors(V,2);
  108.     FILE *file;
  109.     if((file=fopen("vector.txt.","r"))==NULL)
  110.     {
  111.         cout<<"Couldn't open the file!";
  112.         exit(1);
  113.     }
  114.     char data;
  115.     int i=0,j=0,k=0;
  116.     char temp[3];
  117.     data=getc(file);
  118.     while(data!=EOF)
  119.     {
  120.         if(isdigit(data))
  121.         {
  122.             temp[k]=data;
  123.             k++;
  124.         }
  125.         else if(data==']')
  126.         {
  127.             temp[k]='\0';
  128.             k=0;
  129.             X[i].coord[j]=atoi(temp);
  130.             j++;
  131.         }
  132.         else if(data=='\n')
  133.         {
  134.             i++;
  135.             j=0;
  136.         }
  137.         if(X[0].coord[0]==0)
  138.             cout<<i<<" "<<j<<endl;
  139.         data=getc(file);
  140.     }
  141.     fclose(file);
  142.     cout<<endl<<"Writing the array"<<endl;
  143.     for(int i=0;i<100;i++)
  144.     {
  145.         for(int j=0;j<2;j++)
  146.         {
  147.             cout<<X[i].coord[j]<<" ";
  148.         }
  149.         cout<<endl;
  150.     }
  151.     return 0;
  152. }
  153.  
Runtime error #stdin #stdout 0s 15240KB
comments (?)
stdin
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Standard input is empty
stdout
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Couldn't open the file!
https://ideone.com/n7GAul
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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