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Counting Loops

Counting Loops. for Syntax. for (expression1; expression2; expression3)     statement . for Syntax. for (expression1; expression2; expression3)     statement . for Syntax. for (expression1; expression2; expression3)     statement . for Syntax.

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Counting Loops

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  1. Counting Loops

  2. for Syntax for (expression1; expression2; expression3)    statement

  3. for Syntax for (expression1; expression2; expression3)    statement

  4. for Syntax for (expression1; expression2; expression3)    statement

  5. for Syntax for (expression1; expression2; expression3)    statement

  6. for Syntax for (expression1; expression2; expression3)    statement

  7. for Syntax for (expression1; expression2; expression3)    statement

  8. Bad Form cout << “What is 2+2? ”;cin >> sum;for (; sum != 4;){ cout << “Incorrect answer. What is 2+2? ” << endl; cin >> sum; }

  9. Example #1 float average;long sum = 0;short i = 0;cout << “enter positive integer: ”;cin >> max;for(i=0; i <= max; i++)sum += i; average = static_cast<float>(sum) / max; cout << “average is ” << average << endl;

  10. Example #1 float average;long sum = 0;short i = 0;cout << “enter positive integer: ”;cin >> max;for(i=0; i <= max; i++)  sum += i; average = static_cast<float>(sum) / max; cout << “average is ” << average << endl;

  11. Example #1 float average;long sum = 0;short i = 0;cout << “enter positive integer: ”;cin >> max;for(i=0; i <= max; i++)  sum += i; average = static_cast<float>(sum) / max; cout << “average is ” << average << endl;

  12. Example #1 float average;long sum = 0;short i = 0;cout << “enter positive integer: ”;cin >> max;for(i=0; i <= max; i++)  sum += i; average = static_cast<float>(sum) / max; cout << “average is ” << average << endl;

  13. Example #2 float average;long sum = 0;short i = 0;cout << “enter positive integer: ”;cin >> max;for (i=0; i <= max; i+=2)sum += i; average = static_cast<float>(sum) / max; cout << “average is ” << average << endl;

  14. Goal Output * * * * * * * * ** * ** * *

  15. Outputting 5 Lines for (inti = 1; i <= 5; i++) {cout<< endl;}

  16. Outputting 5 Stars for (inti = 1; i <= 5; i++) {cout<< “* ”;}

  17. Combining for (inti = 1; i <= 5; i++){ for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values i=1 j=?

  18. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values i=1 j=1

  19. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * i=1 j=1

  20. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * i=1 j=2

  21. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * i=1 j=2

  22. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * i=1 j=3

  23. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * i=1 j=3

  24. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * i=1 j=4

  25. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * i=1 j=4

  26. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * i=1 j=5

  27. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * i=1 j=5

  28. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * i=1 j=6

  29. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * i=1 j=6

  30. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * i=2 j=?

  31. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * i=2 j=1

  32. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * * i=2 j=1

  33. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * * i=2 j=2

  34. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * * * i=2 j=2

  35. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * * * i=2 j=3

  36. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * * * * i=2 j=3

  37. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * * * * i=2 j=4

  38. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * * * * * i=2 j=4

  39. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * * * * * i=2 j=5

  40. Combining for (inti = 1; i <= 5; i++){    for (int j = 1; j <= 5; j++)  cout << "* ";                      cout << endl;} output variable values * * * * * * * * * * i=2 j=5 oops!!!

  41. Goal vs Actual Goal * * * * * * * * ** * ** * * Actual * * * * * * * * * ** * * * ** * * * ** * * * * i=1 j=5 i=2 j=4 i=3 j=3 i=4 i=5 j=2 j=1

  42. Fixed for (inti=1; i <= 5; i++){    for (int j=1; j <= 5 – i + 1; j++)  cout << "* ";                      cout << endl;} output variable values i=1 j=?

  43. Fixed for (inti=1; i <= 5; i++){    for (int j=1; j <= 5 – i + 1; j++)  cout << "* ";                      cout << endl;} output variable values i=1 j=1

  44. Fixed for (inti=1; i <= 5; i++){    for (int j=1; j <= 5 – i + 1; j++)  cout << "* ";                      cout << endl;} output variable values * i=1 j=1

  45. Fixed for (inti=1; i <= 5; i++){    for (int j=1; j <= 5 – i + 1; j++)  cout << "* ";                      cout << endl;} output variable values * i=1 j=2

  46. Fixed for (inti=1; i <= 5; i++){    for (int j=1; j <= 5 – i + 1; j++)  cout << "* ";                      cout << endl;} output variable values * * i=1 j=2

  47. Fixed for (inti=1; i <= 5; i++){    for (int j=1; j <= 5 – i + 1; j++)  cout << "* ";                      cout << endl;} output variable values * * i=1 j=3

  48. Fixed for (inti=1; i <= 5; i++){    for (int j=1; j <= 5 – i + 1; j++)  cout << "* ";                      cout << endl;} output variable values * * * i=1 j=3

  49. Fixed for (inti=1; i <= 5; i++){    for (int j=1; j <= 5 – i + 1; j++)  cout << "* ";                      cout << endl;} output variable values * * * i=1 j=4

  50. Fixed for (inti=1; i <= 5; i++){    for (int j=1; j <= 5 – i + 1; j++)  cout << "* ";                      cout << endl;} output variable values * * * * i=1 j=4

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