- 08/03/2023
- Computers and Technology
- College
answered
In this problem, we’ll again assume that we have a file called yvrTemperature08.dat containing the temperature at Vancouver International Airport at midnight, 6 A.M., noon and 6 P.M. on given days of the year for 2008. A sample file for testing is provided here: yvrTemperature08.dat.The meteorologists at the airport attempt to record data every day but technical problems mean that data for some days of the year could go missing. We’ll write a program that reads the file and reports the minimum and maximum temperatures recorded at noon over the year to one decimal place.
Assume, again, that the format of the file has the following specifications:
Data for each day is on a line of its own.
For each line:
The first entry is an integer from 1 to 366 (2008 was a leap year) representing the day of the year.
The next four entries are doubles representing the temperature at midnight, 6 A.M., noon and 6 P.M., in that order.
There is at least one line of data in the file. Here’s a sample data file:
1 3.4 2.3 3.5 5.4
2 3.6 2.1 5.7 5.0 4 1.2 1.2 2.3 2.2 5 2.5 1.3 2.4 2.1 6 2.0 1.1 2.3 2.0 . . . 366 1.3 0.3 2.4 2.1
Note that for the particular file yvrTemperature08.dat, data was not recorded on day 3 of the year. You can assume that if data is included for a particular day, the temperatures at all four times of the day are provided.
Reading data from a file is a relatively slow operation--as compared to reading data that’s stored in memory (RAM). You should develop an algorithm that reads each piece of data from the file only once. In other words, don’t re-read the file.
Implement your algorithm in C. Note that nothing has been written for you, you must implement the program in its entirety. Don't forget to print an error message if the file cannot be opened.
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AI-generated answer
To solve this problem, we need to write a program in C that reads a file called yvrTemperature08.dat, which contains temperature data for Vancouver International Airport at different times of the day for each day of the year 2008. The program should report the minimum and maximum temperatures recorded at noon over the year, rounded to one decimal place. Here's a step-by-step approach to solve this problem: 1. Start by including the necessary header files in your C program: `stdio.h` for file input/output operations and `stdlib.h` for general functions. 2. Declare the variables needed for the program. You will need variables to store the day, temperatures at different times, minimum temperature, and maximum temperature. 3. Open the file using the `fopen` function, and check if the file was successfully opened. If not, print an error message and exit the program. 4. Initialize the minimum and maximum temperature variables with appropriate initial values. For example, you can initialize the minimum temperature with a high value and the maximum temperature with a low value. 5. Read the data from the file using a loop. Since each line in the file represents a day, you can use a loop to read each line until the end of the file is reached. 6. Inside the loop, use the `fscanf` function to read the day and temperatures at different times. Store the temperature at noon in a variable. 7. Compare the temperature at noon with the current minimum and maximum temperatures. Update the minimum temperature if the current temperature is lower, and update the maximum temperature if the current temperature is higher. 8. After the loop ends, close the file using the `fclose` function. 9. Finally, print the minimum and maximum temperatures recorded at noon over the year, rounded to one decimal place. You can use the `printf` function with the appropriate format specifier to achieve this. 10. Test your program with the provided sample file, yvrTemperature08.dat, to ensure it is working correctly. Remember, reading data from a file is slower than reading data from memory, so it's important to develop an algorithm that reads each piece of data from the file only once. I hope this helps you understand the steps required to solve this problem. If you have any further questions, feel free to ask!
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Final answer:
The program reads the file yvrTemperature08.dat and reports the minimum and maximum temperatures recorded at noon over the year to one decimal place.
Explanation:
To solve this problem, you can follow these steps:
- Declare variables to store the minimum and maximum temperatures.
- Open the file using the `fopen` function. If the file cannot be opened, print an error message and exit the program.
- Read each line of data from the file using a loop.
- Extract the temperature at noon from each line using the `fscanf` function.
- Update the minimum and maximum temperatures if necessary.
- Close the file using the `fclose` function.
- Print the minimum and maximum temperatures to the console.
Here is an example implementation:
#include <stdio.h> int main() { FILE *file = fopen(""yvrTemperature08.dat"", ""r""); if (file == NULL) { printf(""Error opening file.""); return 1; } double minTemperature = 100.0; double maxTemperature = -100.0; int day; double midnight, morning, noon, evening; while (fscanf(file, ""%d %lf %lf %lf %lf"", &day, &midnight, &morning, &noon, &evening) == 5) { if (noon < minTemperature) { minTemperature = noon; } if (noon > maxTemperature) { maxTemperature = noon; } } fclose(file); printf(""Minimum temperature at noon: %.1lf
"", minTemperature); printf(""Maximum temperature at noon: %.1lf
"", maxTemperature); return 0; }
Learn more about reading and processing data from a file in c here:
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