Hi! Please help me debug the following code in C++. Below, you may find the code and the identified error. Please Ide

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Hi! Please help me debug the following code in C++. Below, you may find the code and the identified error. Please Identify what is incorrect, correct the code, and provide comments to explain. Thanks!
1 #include <iostream> // lets me work with cout 2 #include <fstream> // lets me work with files 3 #include <sstream> // lets me work with strings 4 #include <iomanip> // lets me work with input and output 5 #include <string> // lets me create strings 6 7 using namespace std; // lets me use c++ throughout entire program 8 9 void calculate( float &p, float &q, float &r, float a[], float b[], float c[], int x, int y, int z) // void function that calculates overall grade 10 { 11 int st1=0, st2=0, st3=0; // defines 3 variables as integers 12 for(int i=0; i<x; i++) // for loop from a to x value 13 sti += a; // adds a and sti values, sets it to sti 14 for(int i=0; i<y; i++) // for loop from oto y value 15 st2 += b; // adds b and st2 values, sets it to sta 16 for(int i=0; i<z; i++) // for loop from a to z value 17 st3, += c; // adds c[l] and st3 values, sets it to st3 18 19 p = ((float)st1/(x*20))*100.0; // sets p variable to the equation value of sti 20 9 = ((float)st2/(*10))*100.0; // sets q variable to the equation value of st2 21 r = ((float)st3/(x*20))*100.6; // sets r variable to the equation value of 53 22} 23 24 int main() // main function 25 26 float labs [10], quiz[10], assignment (10); // specifies assignment type and point value, as floats 27 float practice, midterms, finals; // defines practice, midterms $ and finals as floats 28 29 itstream f("marks.txt"); // reads marks.txt file 30 char c; // storesc 31 float marks; // defines marks float 32 int x=0, y=0, z=0; / defines integer values

49 34 while(f >> C >> marks) // while loop to determine what type of work (assignment? quiz? etc) 35 v { 36 if(c = 'L') // if c value is L 37 { 38 labs[x] = marks; // assign marks to labs 39 X++; // increment operator, X = x+1 40 } 41 else if(0 == 'Q') // if c value is 0, 42 { 43 quiz[y] = marks; // assign marks to quiz 44 y++; // increment operator, y = y+1 45 } 46 else if(c = 'A') // if c value is A 47 { 48 assignment [2] = marks; // assign marks to assignment Z++; // increment operator, z = 2+1 50 } 51 else if (c = 'P') // if c value is P 52 practice marks; // assign marks to practice 53 else // otherwise 54 midterms = marks; // assign marks to midterms 55 } 56 57 f.close(); // close file 58 labs[x] practice/5.0; // sets labs[x] to the value of practice divided by 59 60 float avgi, avg2, avg3; // defines avi, av2 and av as loats 61 calculatel avgi, avg2, avg3, labs, quiz, assignment,x,y,z); calculates percentage 62 63 cout << "Enter a grade for the final: " << endl; W prints message to console 64 cin >> finals; // puts in user input as finals 65 66 cout << "Assesment type: average" << endl; // prints message to console .

66 cout << "Assesment type: average" << endl; // prints message to console 67 68 cout << "Labs: << avgi << endl; // prints message to console 69 cout << "Quizzes : < avg2 << endl; // prints message to console 70 cout << "Assignments : << avg3 << endl; // prints message to console 71 cout << "Mid : << midterms << endl; // prints message to console 72 cout << "Final : " << finals << endl; // prints message to console 73 74 avg1 = avg1*.10; // defines avi and sets it equal to average 1 value based on the grade scale 75 avg2 = avg2*.05; // defines avg2 and sets it equal to average 2 value based on the grade scale 76 avg3 = avg3*.10; // defines avg3 and sets it equal to average 3 value based on the grade scale 77 midterms = midterms*.35; // defines midterms and sets it equal to midterms value based on the grade scale 78 finals = finals*.40; // defines finals and sets it equal to finals value based on the grade scale 79 80 float current grade avgi + avg2 + avg3 + midterms + finals; defines current grade as a float 81 cout << Current grade: " << current_grade << endl; / prints message to console 82 return of lets computer know everything ran smoothly 843 85 86 83

LAST RUN on 5/9/2022. 10:12:17 PM X Check 1 failed Output: Enter a grade for the final: Assesment type: average Labs : -nan Quizzes: -nan Assignments : -nan Mid : 0 Final : 100 Current grade : -nan Expected: Enter a grade for the final Labs: 87 -Quizzes: 91 Assignments: 96 Midterm exam: 94 Final exam: 100 Current grade: 95.75