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  1. #include <stdio.h>
  2.  
  3. // function prototype
  4. char calcLetterGrade(int score);
  5.  
  6. int main(void)
  7. {
  8.     printf("Score: 95 -> Grade: %c\n", calcLetterGrade(95));
  9.     printf("Score: 82 -> Grade: %c\n", calcLetterGrade(82));
  10.     printf("Score: 75 -> Grade: %c\n", calcLetterGrade(75));
  11.     printf("Score: 62 -> Grade: %c\n", calcLetterGrade(62));
  12.     printf("Score: 45 -> Grade: %c\n", calcLetterGrade(45));
  13.     printf("Score: -5 -> Grade: %c\n", calcLetterGrade(-5));   // invalid
  14.     printf("Score: 150 -> Grade: %c\n", calcLetterGrade(150)); // invalid
  15.     return 0;
  16. }
  17.  
  18. // **************************************************
  19. // Function: calcLetterGrade
  20. //
  21. // Description:
  22. //   Maps a numeric test score (0–100) to a letter grade.
  23. //   The grading scale is as follows:
  24. //       90–100 -> 'A'
  25. //       80–89  -> 'B'
  26. //       70–79  -> 'C'
  27. //       60–69  -> 'D'
  28. //       0–59   -> 'F'
  29. //   Any score outside 0–100 returns 'I' (invalid).
  30. //
  31. // Parameters:
  32. //   score - numeric test score
  33. //
  34. // Returns:
  35. //   Letter grade ('A', 'B', 'C', 'D', 'F', or 'I')
  36. // **************************************************
  37. char calcLetterGrade(int score)
  38. {
  39.     char result; /* letter grade result */
  40.  
  41.     // map score to letter grade
  42.     if (score >= 90)
  43.         result = 'A';
  44.     else if (score >= 80)
  45.         result = 'B';
  46.     else if (score >= 70)
  47.         result = 'C';
  48.     else if (score >= 60)
  49.         result = 'D';
  50.     else if (score >= 0)
  51.         result = 'F';
  52.     else
  53.         result = 'I'; /* invalid score */
  54.  
  55.     // check for invalid values over 100
  56.     if (score > 100)
  57.         result = 'I';
  58.  
  59.     return result;
  60. }
Success #stdin #stdout 0.01s 5276KB
comments (?)
stdin 
Standard input is empty
stdout 
Score: 95 -> Grade: A
Score: 82 -> Grade: B
Score: 75 -> Grade: C
Score: 62 -> Grade: D
Score: 45 -> Grade: F
Score: -5 -> Grade: I
Score: 150 -> Grade: I
https://ideone.com/OwCc8Z
language:
C (gcc 8.3)
created:
7 days ago
visibility:
public

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