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Understanding Conditional Statements in Java: Pass or Fail Status and Grades

This guide explores the fundamentals of conditional statements in Java programming, particularly focusing on how to determine pass or fail status based on scores. It covers the use of basic if-else statements, complex compound statements for printing grades, methods to avoid code duplication, and nested if-else structures for grade categorization. With code snippets demonstrating practical applications, learners can easily grasp the concepts of using conditionals effectively to control program flow based on specific criteria.

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Understanding Conditional Statements in Java: Pass or Fail Status and Grades

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  1. Comp 110Conditionals Instructor: Prasun Dewan

  2. Prerequisite • Types Math .

  3. Conditionals printPassFailStatus(95) Passed printPassFailStatus(25) Failed publicstaticvoidprintPassFailStatus(int score) { if (score < PASS_CUTOFF) System.out.println("FAILED"); else System.out.println("PASSED"); }

  4. If-Else Statement if ( <boolean expression> ) <statement 1>; else <statement 2>;

  5. If-Else Statement <boolean expression> true false <statement 1> <statement 2>

  6. Compound Statement • publicvoidfancyPrintGrade(int score) • { • if (score < PASS_CUTOFF) • { • System.out.println("**************"); • System.out.println("FAILED"); • System.out.println("**************"); • } • else • { • System.out.println("**************"); • System.out.println("PASSED"); • System.out.println("Congratulations!"); • System.out.println("**************"); • } • }

  7. Compound Statement – { } Convention publicvoidfancyPrintGrade(int score) { if (score < PASS_CUTOFF) { System.out.println("**************"); System.out.println("FAILED"); System.out.println("**************"); } else { System.out.println("**************"); System.out.println("PASSED"); System.out.println("Congratulations!"); System.out.println("**************"); } }

  8. Avoiding Code Duplication in If-Else (Edit) • publicvoidfancyPrintGrade(int score) • { • if (score < PASS_CUTOFF) • { • System.out.println("**************"); • System.out.println("FAILED"); • System.out.println("**************"); • } • else • { • System.out.println("**************"); • System.out.println("PASSED"); • System.out.println("Congratulations!"); • System.out.println("**************"); • } • }

  9. Avoiding Code Duplication in If-Else publicvoidfancyPrintGrade(int score) { System.out.println("**************"); if (score < PASS_CUTOFF) System.out.println("FAILED"); else { System.out.println("PASSED"); System.out.println("Congratulations!"); } System.out.println("**************"); }

  10. If Statement if (score == MAX_SCORE) System.out.println ("Perfect Score! Congratulations!"); if (<boolexpr>) <statement>;

  11. If Statement <boolean expression> true false <statement 1>

  12. Else-If • publicstaticchartoLetterGrade (int score) { • if (score >= A_CUTOFF) • return 'A'; • elseif (score >= B_CUTOFF) • return 'B'; • elseif (score >= C_CUTOFF) • return 'C'; • elseif (score >= D_CUTOFF) • return 'D'; • else • return 'F'; • }

  13. Nested If-Else • if (score >= A_CUTOFF) • return 'A'; • else • if (score >= B_CUTOFF) • return 'B'; • else • if (score >= C_CUTOFF) • return 'C'; • else • if (score >= D_CUTOFF) • return 'D'; • else • return 'F'; 

  14. Nested If-Else

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