Question

C++

Write a function parseScores which takes a single input argument, a file name, as a string. Your function should read each line from the given filename, parse and process the data, and print the required information. Your function should return the number of student entries read from the file. Empty lines do not count as entries, and should be ignored. If the input file cannot be opened, return -1 and do not print anything.

    Your function should be named parseScores
    Your function should have one input argument: a file name, as a string.
    Your function should return an int, representing the number of students' entries read from the file.
        If the given file name can not be opened, your function should return -1.
        Empty lines in the file should not be counted as entries.
    Each line of the file contains four elements, separated by commas (,)
        SCORE,SCORE,SCORE,STUDENT NAME
        After parsing each line, you should print:

        STUDENT NAME: AVG SCORE

        Where AVG SCORE is the average of the three scores for STUDENT NAME. The three scores may be treated as floating point numbers.

Note: The split() function is provided, and functions as it does in the homework assignments, to make parsing the output easier. Recall that split takes a string s and splits it at the input delimiter sep, to fill the array words[] up to a capacity of max_words. The return value of split is the number of actual words the string is split into.
int split(string s, char sep, string words[], int max_words)

Answer 1

SOURCE CODE:

//Please read comments carefully and alter the program if required thank you
//This function parses the input file with given filename.
//Pleae make modifications if any required.
//Assuming that split function exists and required header string,iostream,ifstream are included this works fine.
//Please read comments for detail description
int parseScores(string filename)
{
//Values declared and initialized requirements mentioned.
string words[4]; //To store words from split function.
int i,val,count=0; //To store the no. words returned and count of lines parsed.
float avgscore=0; //This is to store avergae score calculated.
ifstream f(filename); //filename given to read into f
if (f.is_open()) { //checks if it is opened if no returns -1.
string line; //variable to read line
while (getline(f, line)) { //reads a line by line until end.
val=split(line,',',words,4); //split function provided in question.
if(val==4) //if given line is correct then it executes.
{
for(i=0;i<3;i++) //this averages the score
{
  
avgscore=avgscore+stoi(words[i]); //converts string to integer and then sums it up
}
avgscore=avgscore/3;
cout<<words[4]<<" : "<<"avgscore"; //prints name and avgscore.
count++; //calculates the count of totla lines parsed
}
else
{
return count; //if line found in non-format terminates function by returning parsed lines
}
}
}
else
{
return -1; //if file open fails.
}
f.close(); //closes the file.
return count; //returns the count.
}