Question

Write a Java program that will ask the user for his/her mark (numerical integer mark) and then convert this numerical mark into letter grades. The following is a guideline to the grading scale used. The numeric range within parenthesis maps to the preceding letter grade. If the user gave you a number greater than 100 or less than 0, you should print a message that the input is invalid. In this code, DO NOT USE && OPERATOR. You should use if-else.

Grades Mapping

A+ (90 to100)

A (80 to 89)

B+ (75 to 79)

B (70 to 74)                                                                                                                                           

C+ (65 to 69)       

C (60 to 64)     

D+ (55 to 59)    

D (50 to 54)

E (40 to 49)        

F (0 to 39)

Answer 1

Required program in java -->

import java.util.*;
public class Main
{
   public static void main(String[] args) {
   Scanner sc= new Scanner(System.in);
   System.out.println("Enter marks"); //ask user for input
   int marks = sc.nextInt(); //read input from user
   if((marks+10)>=100){ //if marks+10 is smaller than 100
   if(marks<=100){ //if marks is less than or equal to 100
   System.out.println("A+"); //then print A+
   }
   else{ //else
   System.out.println("Invalid Input"); //print invalid
   }
   }
   else if((marks+10)>=90){
   System.out.println("A");
   }
   else if((marks+5)>=80){
   System.out.println("B+");
   }
   else if((marks+5)>=75){
   System.out.println("B");
   }
   else if((marks+5)>=70){
   System.out.println("C+");
   }
   else if((marks+5)>=65){
   System.out.println("C");
   }
   else if((marks+5)>=60){
   System.out.println("D+");
   }
   else if((marks+5)>=55){
   System.out.println("D");
   }
   else if((marks+10)>=50){
   System.out.println("E");
   }
   else if((marks+40)>=40){
   System.out.println("F");
   }
   }
}

we cannot use && operators here, so we have used + operator to check whether the given input falls in the criteria. And according to marks, we have provided the resultant grade.

so, if user enters 55

o/p -> D+