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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. int  mxlen;
  4. int curlen=0;
  5. typedef struct point
  6. {
  7.     int x,y;
  8.  
  9. } XY;
  10.  
  11. XY* insertatp(XY arr[],int p,int q,int idx){
  12.     if(idx<0||idx>curlen)
  13.         {
  14.          printf("Err");
  15.          return arr;
  16.         }
  17.     if (curlen==mxlen){
  18.         mxlen= mxlen*2;
  19.         arr=(XY*)realloc(arr,sizeof(XY)*mxlen);
  20.     for(int i=curlen-1;i>=idx;i--)
  21.     {
  22.         arr[i+1].x= arr[i].x;
  23.         arr[i+1].y=arr[i].y;
  24.  
  25.     }
  26.       arr[idx].x=p;
  27.       arr[idx].y=q;
  28.       curlen++;
  29.       printf("New mxlen  %d changed  CURlen  %d",mxlen,curlen);
  30.       return   arr;
  31.     }
  32. else {
  33.     for(int i=curlen-1;i>=idx;i--)
  34.     {
  35.         arr[i+1].x= arr[i].x;
  36.         arr[i+1].y=arr[i].y;
  37.  
  38.     }
  39.       arr[idx].x=p;
  40.       arr[idx].y=q;
  41.       curlen++;
  42.       printf("Unchanged   mxlen  %d changed  CURlen  %d",mxlen,curlen);
  43.       return   arr;
  44.  
  45. }
  46. }
  47.  
  48.  
  49.  
  50.  
  51. void  printarr(XY arr[]){
  52. printf("Printing  arr\n");
  53.   for(int i=0; i<curlen; i++)
  54.     {
  55.         printf("%d %d",arr[i].x,arr[i].y);
  56.     }
  57.  
  58.  
  59. }
  60.  
  61.  
  62.  
  63.  
  64.  
  65.  
  66. int main()
  67. {
  68.     int u;
  69.     printf("Enter Size: ");
  70.     scanf("%d",&u);
  71.     mxlen=u;
  72.  
  73.     XY*  arr=(XY*)malloc(sizeof(XY)*mxlen);
  74.     printf("Insert arr\n");
  75.     for(int i=0; i<u; i++)
  76.     {
  77.         scanf("%d %d",&arr[i].x,&arr[i].y);
  78.     }
  79.     curlen=u;
  80.  
  81.  
  82.  
  83.     int  n=3;
  84.     while(n>0){
  85.  
  86.        int p,q,idx;
  87.        printf("Enter  Coor  and idx \n");
  88.        scanf("%d %d %d",&p,&q,&idx);
  89.        arr=insertatp(arr,p,q,idx);
  90.        printarr(arr);
  91.  
  92. n--;
  93.  
  94.  
  95.  
  96.  
  97.  
  98.  
  99.  
  100.  
  101.  
  102.     }
  103.  
  104.  
  105.  
  106. free(arr);
  107.  
  108.  
  109.     return 0;
  110. }
  111.  
Success #stdin #stdout 0s 5324KB
comments (?)
stdin
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Standard input is empty
stdout
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Enter Size: Insert arr
Enter  Coor  and idx 
ErrPrinting  arr
Enter  Coor  and idx 
ErrPrinting  arr
Enter  Coor  and idx 
ErrPrinting  arr
https://ideone.com/nPNL2i
language:
C++14 (gcc 8.3)
created:
8 hours ago
visibility:
public

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