WAP to ask user to enter marks of 5 subjects and calculate the percentage then print GRADE according to marks in percentage
Objective
Write a C++ program to calculate student grades based on calculated percentage marks.
Algorithm / Approach
- Read marks for 5 subjects.
- Calculate the percentage:
per = (m1+m2+m3+m4+m5) / 5.0. - Use an
if (per >= 80)for Grade A. - Use cascading
else ifstatements for lower grades (70, 60, 50). - Use a final
elsefor Grade E.
main.cpp
#include<iostream>
using namespace std;
int main() {
int m1,m2,m3,m4,m5;
float per;
cout<<"Enter Marks Subject 1: ";
cin>>m1;
cout<<"Enter Marks Subject 2: ";
cin>>m2;
cout<<"Enter Marks Subject 3: ";
cin>>m3;
cout<<"Enter Marks Subject 4: ";
cin>>m4;
cout<<"Enter Marks Subject 5: ";
cin>>m5;
per = (m1+m2+m3+m4+m5)/5.0;
cout<<"Your Marks % is "<< per<< endl;
if(per>=80)
cout<<"Your Grade is A \n";
else if(per>= 70)
cout<<"Your Grade is B \n";
else if(per>= 60)
cout<<"Your Grade is C \n";
else if(per>= 50)
cout<<"Your Grade is D \n";
else
cout<<"Your Grade is E \n";
return 0;
}Expected Output
Enter Marks Subject 1: 90 Enter Marks Subject 2: 91 Enter Marks Subject 3: 92 Enter Marks Subject 4: 92 Enter Marks Subject 5: 90 Your Marks % is 91 Your Grade is A
Explanation of the Program
- Cascading
else ifstructures are highly sensitive to their sequential order. - Because the program checks from top to bottom and stops at the first true condition, we MUST check the highest percentages first. If we checked
per >= 50first, a student with 90% would trigger that condition and be incorrectly awarded a D grade!
Complexity
Time Complexity
O(1)
Space Complexity
O(1)
