Here, we are discussing a C++ program to find the Grade of a Student based on Marks obtained in all Subjects using a user-defined function. Here the user is allowed to enter the number of subjects and the grades according to the marks will be like the below table
| Average Mark | Grade |
| 91-100 81-90 71-80 61-70 51-60 41-50 33-40 21-32 0-20 |
A1 A2 B1 B2 C1 C2 D E1 E2 |
To calculate the grade of a student based on total marks. The grade is calculated based on the total marks obtained for n subjects. Add marks of all the n subjects and divide it by n to get the average mark. And based on this average mark, check the grade from our table.
Here the C++ program asks the user to enter the number of the subject. For example, if he/she enters 3 as the number of subjects, then the program further asks to enter marks obtained in 3 subjects.
This program calculates the grade of the student using a user-defined function
Get the number of subjects into the variable n and get the marks of n subjects to the array mark[10]; pass the array of marks and the number of subjects to a user-defined function that says findGrade( float mark[ ], int n );
Defining the function findGrade (float [ ], int)
First, we have to add all the marks for n subjects. For this, get each subject’s mark and add them together.
float sum=0;
for(i=0; i
Now we have to divide the total mark by the number of subjects to get the average.
avg = sum/n;
Now we have the average mark in the variable avg. Compare the value with the average mark range.
if(avg>=91 && avg<=100)
return "A1";
else if(avg>=81 && avg<91)
return "A2";
else if(avg>=71 && avg<81)
return "B1";
else if(avg>=61 && avg<71)
return "B2";
else if(avg>=51 && avg<61)
return "C1";
else if(avg>=41 && avg<51)
return "C2";
else if(avg>=33 && avg<41)
return "D";
else if(avg>=21 && avg<33)
return "E1";
else if(avg>=0 && avg<21)
return "E2";
else
return "Invalid!"
get the return value of the function and display the grade.
Step 1: Call the header file iostream.
Step 2: Use the namespace std.
Step 3: Declare a user-defined function const char* findGrade(float [], int);
Step 4: Open the integer type main function; int main().
Step 5: Declare integer type variables I, n. float type array mark[10];
Step 6: Ask the user to enter the number of subjects
Step 7:Get the number into the variable n;
Step 8: Ask the user to enter the marks obtained;
Step 9: Get the numbers into the array mark[10];
Step 10: call step: 13 and get the grade
Step 11:Print the grade;
Step 12: exit;
Step 13: const char* findGrade(float mark[], int n)
Calculate the total marks and get the result into a variable sum;
Calculate the average and get the result into the variable avg;
Compare the value of avg with the average mark range and return the corresponding grade;
#include<iostream>
using namespace std;
const char* findGrade(float [], int);
int main()
{
int i, n;
float mark[10];
cout<<"Enter Number of Subjects (max. 10): ";
cin>>n;
cout<<"Enter Marks obtained in "<<n<<" Subjects: ";
for(i=0; i<n; i++)
cin>>mark[i];
cout<<"\nGrade = "<<findGrade(mark, n);
cout<<endl;
return 0;
}
const char* findGrade(float mark[], int n)
{
int i;
float sum=0, avg;
for(i=0; i<n; i++)
sum = sum+mark[i];
avg = sum/n;
if(avg>=91 && avg<=100)
return "A1";
else if(avg>=81 && avg<91)
return "A2";
else if(avg>=71 && avg<81)
return "B1";
else if(avg>=61 && avg<71)
return "B2";
else if(avg>=51 && avg<61)
return "C1";
else if(avg>=41 && avg<51)
return "C2";
else if(avg>=33 && avg<41)
return "D";
else if(avg>=21 && avg<33)
return "E1";
else if(avg>=0 && avg<21)
return "E2";
else
return "Invalid!";
}
Enter Number of Subjects (max. 10): 6 Enter Marks obtained in 6 Subjects: 69 80 55 74 45 91 Grade = B2
