Question

This program should be written in C

1. Thoroughly following the Code Conventions, write an efficient program, which ask the user for their numeric grade, and determines and displays the equivalent letter grade, based on the following information:
   • Use appropriate data types and initialize the variables correctly
   • Use the following grading scale:
     • A: 90 - 100
     • B: 80 - < 90
     • C: 70 - < 80
     • D: 60 - < 70
     • F: 0 - < 60
   • If the input is invalid, e.g., grade > MAX_A, an appropriate and specific error message should be displayed starting with a blank line and tab, and following with a blank line; in other words, make the error message stand out from the rest of the information displayed to the screen, for example, where the ellipses below are what is displayed before and after the error message, and the error message is offset and surrounded by white space:

     • ...
       
           Error: The numeric grade must be less than or equal to 100.
       
       ...

   • Thoroughly test your program by using appropriate test cases based on the values in the grading scale, e.g., -1, 0, 59, 60, 69, 70, 79, 80, 89, 90, 100, 101
   • Do NOT use stacked if or if-else constructs, i.e., this problem, like most, should use nested if-else constructs, which usually are more efficient, i.e., stacked if or if-else constructs are usually inefficient
   • Make sure your output is written professionally, e.g., sentences begin with a capital letter and end with punctuation, words are spelled correctly, there is a space after a colon, there is a blank line between getting the input and displaying the results, which should consist of only one statement, e.g., Your letter grade is ..., etc.
   • Only use the concepts covered through Module 5; see the module overviews
2. Once you have completed and thoroughly tested your program, unless told otherwise during class, complete the following steps:
   1. Copy and paste your code from your IDE into a Microsoft Word document. Do NOT reformat your code after pasting it.
   2. Save and close the Word document.
   3. Attach the Word document to this assignment.
   4. Submit it.
   5. Verify the document you just submitted is the correct one.

Answer 1

Answer to the above question as follows-

we have to use nested if-else structure.

A nested if else means an if statement within another if statement.

These are considered to be faster than if-else-if ladder.

Required code for C language is as follows

#include <stdio.h>

int main() {
  
   int n; // declaring variable n to store numeric grade value
   char grade; // declaring character grade to store letter grade value
  
  
   //Input
   printf("Enter your numeric grade.\n");
   scanf("%d",&n); // takng input from the user
  
  
   //Evaluation
   if( n>100 || n<0 ){ // check if invalid numeric grade
   printf("\n\n\n"); // print in desired format
   printf(" Error: The numeric grade must be less than or equal to 100.");
   printf("\n\n\n");
   exit(0); // exit from the program
   }
   else{
   if ( n >= 90)
{
grade = 'A'; // assign grade A
}
else
{
if (n >= 80 && n <= 89)
{
grade = 'B'; // assign grade B
}
else
{
if (n >= 70 && n <= 79)
{
grade = 'C'; // assign grade C
}
else
{
if (n >= 60 && n <= 69)
{
grade = 'D'; // assign grade D
}
else
{
grade = 'F'; // assign grade F
}
}
}
}
   }
     
     
   //Output   
   printf("\nYour letter grade is %c\n",grade); //Display the letter grade
   return 0;
}

Screenshot of the executed code is as follows-

Screenshot of the tested output are-

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Thank You !!!