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Use C code to consider the following contents of a text file called attendance.txt which records the student daily attendance for Class A and B. Day        ClassA       ClassB 1                50            38 2                48            40 3                44            36 Write C statements to perform the following: -Declare two file pointers named fp1 and fp2. -Open the attendance.txt text file for reading using fp1 file pointer. If the file is not opened successfully, display an error message “File opening errors” and exit the program. -Open the attnAverage.txt text file for writing using fp2 file pointer.

Use C code to consider the following contents of a text file called attendance.txt which records the student daily attendance for Class A and B. Day        ClassA       ClassB 1                50            38 2                48            40 3                44            36 Write C statements to perform the following: -Declare two file pointers named fp1 and fp2. -Open the attendance.txt text file for reading using fp1 file pointer. If the file is not opened successfully, display an error message “File opening errors” and exit the program. -Open the attnAverage.txt text file for writing using fp2 file pointer.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
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Use C code to consider the following contents of a text file called attendance.txt which records the student daily attendance for Class A and B.

Day        ClassA       ClassB
1                50            38
2                48            40
3                44            36

Write C statements to perform the following:
-Declare two file pointers named fp1 and fp2.

-Open the attendance.txt text file for reading using fp1 file pointer. If the file is not opened
successfully, display an error message “File opening errors” and exit the program.

-Open the attnAverage.txt text file for writing using fp2 file pointer.

Expert Solution
Step 1

I have implemented the given requirements as per the specification. The code is as follows:

 

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

int main(void)
{
    FILE *fp1, *fp2;
    fp1 = fopen("attendence.txt", "r");
    fp2 = fopen("attnAverage.txt", "w+");
    if (fp1 == NULL || fp2 == NULL)
    {
        perror("File opening error!");
        exit(1);
    }

    char line[128];
    char val[3];
    int attendence[50] = {0};
    int k = 0, len = 0, count = -1, digit = 0;

    while (fgets(line, sizeof(line), fp1) != NULL)
    {
        count++;
        if (count == 0)
            continue;
        int l = sizeof(line) / sizeof(line[0]);
        for (int i = 0; i < l; i++)
        {
            char ch = line[i];
            if (ch == ' ')
                continue;
            else if (ch == '\0')
                break;
            else
            {
                if (i == 0)
                    continue;
                val[k++] = ch;
                if (line[i + 1] == ' ' || line[i + 1] == '\0')
                {
                    if (val[0] == '\0' || val[1] == '\0')
                        continue;
                    digit = (val[0] - '0') * 10 + (val[1] - '0');
                    attendence[len++] = digit;
                    k = 0;
                    val[0] = '\0';
                    val[1] = '\0';
                    val[2] = '\0';
                }
            }
        }
    }
    float avgA = 0.0, avgB = 0.0;
    int size = sizeof(attendence) / sizeof(attendence[0]);
    for (int i = 0; i < size; i++)
    {
        if (i % 2 == 0)
            avgA += attendence[i];
        else
            avgB += attendence[i];
    }
    avgA /= count;
    avgB /= count;

    std::ostringstream osa;
    std::ostringstream osb;

    fprintf(fp2, "Average of class A is ");
    osa << avgA;
    fprintf(fp2, osa.str().c_str());
    fprintf(fp2, "\nAverage of class B is ");
    osb << avgB;
    fprintf(fp2, osb.str().c_str());
    printf("\nAverage of class A is %f.", avgA);
    printf("\nAverage of class B is %f.", avgB);
    fclose(fp1);
}
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