Write a C program that will read the required values from th

Write a C program that will read the required values from the input file. Using the thrust, time, and increment between timesteps, compute the total thrust and write separate user-defined functions to compute the total impulse, specific impulse, and average thrust. Print the total impulse, specific impulse, and average thrust to the computer screen and to an output file called impulse-thrust.

The total impulse is the integral of the thrust over the operating duration of the motor. This can be approximated by

I_t = t(F₁+F₂+F₃+…)

where: I_t = total impulse in lb-sec
t = time increment in seconds
F₁, F₂, F₃, … = thrust at timesteps 1, 2, 3, … in lb

The specific impulse is the total impulse divided by the weight of the propellant burned in the test.

I_sp = I_t/m

where: I_sp = specific impulse in seconds
m = mass of propellant burned in pounds

The average thrust is found by dividing the total impulse by the thrust time.

F_avg = I_t/t

where: F_avg = average thrust in lb
t = total test time in seconds

An input data file called time-thrust contains time, increment, and thrust data for a rocket test where themass of propellant burned was 1.54 lb. The first record line of the input file is the control number which defines the number of data points to be read into the program. Each succeeding record line has three columns. The first column is the time in seconds, the second column is the increment between timesteps in seconds, and the third column is the thrust in pounds. The input file is comma delimited.

OUTPUT FORMAT:

********************************************

         ROCKET MOTOR TEST RESULTS

Total Impulse:     XXX.X lb-sec

Specific Impulse:   XXX.X sec

Average Thrust:     XXX.X lb

********************************************

Input file data

Solution

Please follow the code and comments for description :

CODE :

#include <stdio.h> // required header files
#include <stdlib.h>
#include <string.h>

int main() // driver method
{
    FILE * fp; // required initialisations of the variables
    FILE * fptr;
    char * line = NULL;
    size_t len = 0;
    ssize_t read;
    char * readData = NULL;
    char * tot_tests = NULL;
    int count = 0;
    char timeInSec[22], incTimeSteps[22], thrust[22];
    double timeInSecVal, incTimeStepsVal, thrustVal, mass = 1.54, deltaT = 1.00, thrustSumVal, totalTestTime, totalImpulse, specificImpulse, avgThrust;

    fp = fopen(\"time-thrust.txt\", \"r\"); // reading the data fromt the file
    if (fp == NULL) { // checking for null values if any
        exit(0); //exiting the code if any nulls
    }
  
    fptr = fopen(\"impulse-thrust.txt\", \"w\"); // opening the file to write the output data
    if(fptr == NULL) // checking the null condition
    {
      printf(\"Error!\"); // print the error if any
      exit(1);
    }
    fprintf(fptr,\"%s\", \"********************************************\ \"); // print data to file
    fprintf(fptr,\"%s\", \"         ROCKET MOTOR TEST RESULTS          \ \"); // print data to file
  
    printf(\"********************************************\ \"); // print data to console
    printf(\"         ROCKET MOTOR TEST RESULTS          \ \"); // print data to console
    while ((read = getline(&line, &len, fp)) != -1) { // reading the data from the file
        if(count == 0) { // getting the total count of tests
            tot_tests = line; // saving it to a variable
        } else { // else read to a line
            readData = line;
          
            strcpy(timeInSec, strtok(line , \",\")); // seperating the data from comma deleimited
            strcpy(incTimeSteps, strtok(NULL, \",\"));
            strcpy(thrust , strtok(NULL, \",\"));
          
            timeInSecVal = atof(timeInSec); // conver the string data to the double data type
            incTimeStepsVal = atof(incTimeSteps);
            thrustVal = atof(thrust);
          
            thrustSumVal = thrustSumVal + thrustVal; // adding up to get the sum of thrusts values
          
            totalTestTime = totalTestTime + timeInSecVal; // adding up to get the total test time of the results
        }
        count++; // incrementing the count
    }
  
    totalImpulse = deltaT * thrustSumVal; // getting the results calulcated
    printf(\"\ The Total Impulse is : %0.2f lb-sec \ \", totalImpulse); // print data to console
    fprintf(fptr,\"%s %0.2f %s\", \"\ The Total Impulse is : \", totalImpulse, \" lb-sec\"); // print data to file
  
    specificImpulse = thrustSumVal / mass; // getting the results calulcated
    printf(\"\ The Specific Impulse is : %0.2f sec \ \", specificImpulse); // print data to console
    fprintf(fptr,\"%s %0.2f %s\", \"\ The Specific Impulse is : \", specificImpulse, \" sec\"); // print data to file
  
    avgThrust = thrustSumVal / totalTestTime; // getting the results calulcated
    printf(\"\ The Average Thrust is : %0.2f lb \ \", avgThrust); // print data to console
    fprintf(fptr,\"%s %0.2f %s\", \"\ The Average Thrust is : \", avgThrust, \" lb\"); // print data to file
  
    printf(\"********************************************\ \"); // print data to console
    fprintf(fptr,\"%s\", \"\ ********************************************\ \"); // print data to file
  
    fclose(fp); //closing the files
    fclose(fptr);
  
    return 0;
}

time-thrust.txt :

22
0.0,0.0,0.0
0.1,0.1,50.0
0.2,0.1,100.0
0.3,0.1,140.0
0.4,0.1,150.0
0.5,0.1,155.0
0.6,0.1,155.0
0.7,0.1,154.0
0.8,0.1,150.0
0.9,0.1,149.0
1.0,0.1,148.0
1.1,0.1,140.0
1.2,0.1,138.0
1.3,0.1,132.0
1.4,0.1,120.0
1.5,0.1,100.0
1.6,0.1,80.0
1.7,0.1,50.0
1.8,0.1,30.0
1.9,0.1,20.0
2.0,0.1,10.0
2.1,0.1,0.0

impulse-thrust.txt :

********************************************
         ROCKET MOTOR TEST RESULTS        

The Total Impulse is : 2171.00 lb-sec
The Specific Impulse is : 1409.74 sec
The Average Thrust is : 93.98 lb
********************************************

Hope this is helpful.