Absolutely no arrays or vectors may be used$)$ Purpose:Under the Charm budgetary measures, fill rates will determine the number of sections offered by a department and whether a given class will be canceled or not.In this Lab you will write a C$++$ program to determine fill rates and output report needed by the CIS department. See file Spring$2024.$txt $.$ Structure mandated: There is to be main$(),$ an output$()$ function and no other function except for an optional signature function.In main$()$ open an input file Spring$2024.$txt that will remain open for the entire program execution.Also in main$()$ open an output file that will remain open until the end of the execution $($see slide $9$ of Everything you need to know about File I$/$O$).$Output the heading directly to the file from main$().$Within a loop process the following input, calculation, and output until end of file.Inputstring for course CRN number,string for class name $($e$.$g$.$ CIS D$002.-62$Z$),$string for modalityinteger for current enrollmentinteger for maximum enrollment,integer for number of students on wait$-$list,Use getline$($file$,$ string name$)$ to input text with spaces such as the name of the class. You will enjoy knowing about file.ignore$().$ Mac users usually are using a text editor that has $\backslash$r$\backslash$l i$.$e$.$ two characters, at the end of each line. See separate item in this module. If modality is not "ONLINE" change it to "HYBRID". Computation Warning: avoid integer division truncation issues. File rate is sum of current enrollment plus number of students on wait$-$list divided by the maximum enrollment. N$.$B$.$ If the maximum enrollment is zero, skip this data completely since dividing by zero is undefined.Output: Call output function to output to the file opened the CRN #$,$ class title, the fill rate formatted with one digit to the right of the decimal point, and the modality. After all data is read, i$.$e$.$ after the loop is done executing, output the highest fill rate along with the class name $($only these two data items!$)$ THEME ISSUES: file input, file output Sample output:CRN Course Fill Modality Rate $\%00428$ CIS $002\mathrm{.}64$Z $75\mathrm{.}0$ ONLINE$41239$ CIS $003\mathrm{.}02$Z $52\mathrm{.}5$ ONLINE$44153$ CIS $003\mathrm{.}03$Z $50\mathrm{.}0$ ONLINE. $.\mathrm{.}47835$ CIS $398\mathrm{.}64$Z $86\mathrm{.}7$ ONLINE$47777$ CIS $399\mathrm{.}64$Z $113\mathrm{.}3$ ONLINEHighest Fill Rate: CIS D$040\mathrm{.}64$Z $163\mathrm{.}3$