Flight Recorder Data

I have to write a program that will work with a data file and will be able to read a time a give you the height.
Flight.txt is
0.0 0.0
1.0 7.9
2.0 15.7
3.0 23.3
5.0 38.7
10.0 72.3
20.0 128.9
30.0 168.3
40.0 192.5
50.0 200.1
60.0 192.8
70.0 168.3
80.0 128.4
90.0 72.7
ENG40_Flight.cpp
so far i have this but it ask me to enter a time but it wont give me a height back.

insert

Code:

#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
    int k;
    double time, height, time1, height1, time2, height2;

    FILE*mydata;
    mydata = fopen("F:\\Flight.txt", "r");
{
        k = fscanf(mydata, "%lf %lf", &time1, &height2);
} 
{
    printf("Enter a time\n");
    scanf("%lf", &time);
    
    while (k==2)
    {
          fscanf(mydata, "%lf %lf", &time2, &height2);
          if (time1 =< time =< time2)
          {
          height = height1 + ((time - time1) / (time2 - time1)) - (height2 - height1);
          return height;
          printf("The height is %lf\n", &height);
          break;
          }
          else
          {
              time1=time2;
              height1=height2;
          }
          }     
    
    fclose(mydata);
    system("PAUSE");
    return(0);
}}

FYI, in the future, please post anything that has to do with C in the C forum, not the C++ forum.

First, indentation!

Code:

#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
  int k;
  double time, height, time1, height1, time2, height2;

  FILE *mydata;
  mydata = fopen("F:\\Flight.txt", "r");
  {
    k = fscanf(mydata, "%lf %lf", &time1, &height2);
  }
  {
    printf("Enter a time\n");
    scanf("%lf", &time);

    while (k == 2) {
      fscanf(mydata, "%lf %lf", &time2, &height2);
      if (time1 =< time =< time2) {
        height = height1 + ((time - time1) / (time2 - time1)) - (height2 - height1);
        return height;
        printf("The height is %lf\n", &height);
        break;
      } else {
        time1 = time2;
        height1 = height2;
      }
    }

    fclose(mydata);
    system("PAUSE");
    return (0);
  }
}

line 19 - when do you assign k for this comparison to pass/fail at some point.
line 21 - you need to express it as a <= b && b <= c
line 23 - stops lines 24 and 25 from ever happening
line 24 - read up on printf - you don't need & when printing values.