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Java Program to Calculate Grades of Students
This post covers a program in Java that finds and prints the grade of a student based on the marks entered by the user at run-time of the program.
The grades of students must be calculated as per the following table:
Average Mark Range | Grade |
---|---|
>= 94 | A |
>= 90 and < 94 | A- |
>= 87 and < 90 | B+ |
>= 83 and < 87 | B |
>= 80 and < 83 | B- |
>= 77 and < 80 | C+ |
>= 73 and < 77 | C |
>= 70 and < 73 | C- |
>= 67 and < 70 | D+ |
>= 63 and < 67 | D |
>= 60 and < 63 | D- |
< 60 | F |
Note: In the above table, the range >= 90 and < 94 means that if the average mark is greater than or equal to 90 and less than 94, then the grade should be A-. Under this range, some marks may lie between 90, 90.23, 92, 93.89, etc. That is, in the range of 90-94 here, 90 is included, whereas 94 is excluded.
Find Grades of Students in Java: Basic Version
The question is: write a program in Java to find the grade of a student using if-else. The program given below has its answer:
import java.util.Scanner; public class CodesCracker { public static void main(String[] args) { float[] marks = new float[8]; float sum=0, avg; int i; Scanner scan = new Scanner(System.in); System.out.print("Enter Marks Obtained in 8 Subjects: "); for(i=0; i<8; i++) marks[i] = scan.nextFloat(); for(i=0; i<8; i++) sum = sum + marks[i]; avg = sum/8; System.out.print("\nGrade = "); if(avg>=94) System.out.println("A"); else if(avg>=90 && avg<94) System.out.println("A-"); else if(avg>=87 && avg<90) System.out.println("B+"); else if(avg>=83 && avg<87) System.out.println("B"); else if(avg>=80 && avg<83) System.out.println("B-"); else if(avg>=77 && avg<80) System.out.println("C+"); else if(avg>=73 && avg<77) System.out.println("C"); else if(avg>=70 && avg<73) System.out.println("C-"); else if(avg>=67 && avg<70) System.out.println("D+"); else if(avg>=63 && avg<67) System.out.println("D"); else if(avg>=60 && avg<63) System.out.println("D-"); else System.out.println("F"); } }
The snapshot given below shows the initial output produced by the above Java program:
Now supply the marks obtained in 8 subjects. Here is its sample run, after providing marks like 94, 97, 92, 89, 86, 98, 99, and 88 as eight subject marks:
The above program can also be created in this way:
import java.util.Scanner; public class CodesCracker { public static void main(String[] args) { float[] marks = new float[8]; float sum=0; Scanner scan = new Scanner(System.in); System.out.print("Enter Marks Obtained in 8 Subjects: "); for(int i=0; i<8; i++) { marks[i] = scan.nextFloat(); sum += marks[i]; } float avg = sum/8; String grade = ""; if(avg>=94) grade = "A"; else if(avg>=90 && avg<94) grade = "A-"; else if(avg>=87 && avg<90) grade = "B+"; else if(avg>=83 && avg<87) grade = "B"; else if(avg>=80 && avg<83) grade = "B-"; else if(avg>=77 && avg<80) grade = "C+"; else if(avg>=73 && avg<77) grade = "C"; else if(avg>=70 && avg<73) grade = "C-"; else if(avg>=67 && avg<70) grade = "D+"; else if(avg>=63 && avg<67) grade = "D"; else if(avg>=60 && avg<63) grade = "D-"; else grade = "F"; System.out.println("\nGrade = " +grade); } }
Find Grades of Students in Java: Complete Version
Since the program given above has some limitations, such as what if the user enters a mark greater than 100?
Also, the program only covers eight subjects?
Therefore, keeping in mind these types of limitations, I've modified the program and created a new one, as given below.
import java.util.Scanner; public class CodesCracker { public static void main(String[] args) { float[] marks = new float[8]; float sum=0; Scanner scan = new Scanner(System.in); System.out.print("Enter Total Number of Subjects: "); int tot = scan.nextInt(); System.out.print("Enter Marks Obtained in " +tot+ " Subjects: "); for(int i=0; i<tot; i++) { marks[i] = scan.nextFloat(); sum += marks[i]; } float avg = sum/tot; String grade = ""; if(avg>=94 && avg<=100) grade = "A"; else if(avg>=90 && avg<94) grade = "A-"; else if(avg>=87 && avg<90) grade = "B+"; else if(avg>=83 && avg<87) grade = "B"; else if(avg>=80 && avg<83) grade = "B-"; else if(avg>=77 && avg<80) grade = "C+"; else if(avg>=73 && avg<77) grade = "C"; else if(avg>=70 && avg<73) grade = "C-"; else if(avg>=67 && avg<70) grade = "D+"; else if(avg>=63 && avg<67) grade = "D"; else if(avg>=60 && avg<63) grade = "D-"; else if(avg>=0 && avg<60) grade = "F"; else grade = "Invalid Input!"; if(grade.equals("Invalid Input!")) System.out.println("\nInvalid Input!"); else System.out.println("\nGrade = " +grade); } }
Here is its sample run with user input 5 as the number of subjects and 70, 78, 90, 94, and 88 as the five subject marks:
Same Program in Other Languages
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