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Activation Record

Activation Record. void GetAllData (float a[][MAX_COLS], int& numRows , int& numCols ) { cin >> numRows >> numCols ; for (. . .) for (. . .) cin >> a[ i ][j]; }. int main() { float allScores[MAX_ROWS][MAX_COLS]; int rows, cols;

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Activation Record

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  1. Activation Record void GetAllData(float a[][MAX_COLS], int& numRows, int& numCols) { cin >> numRows >> numCols; for (. . .) for (. . .) cin >> a[i][j]; } int main() { float allScores[MAX_ROWS][MAX_COLS]; int rows, cols; GetAllData(allScores, rows, cols); . . . } Rows: cols: allScores[][]: ? ? ? 5 24 … &numRows: &numCols: a[][]: Return Address ? ? ? 5 24 …

  2. Activation Record GetInput() main() void GetInput(float& payRate, float& hoursWorked) { cout << "Enter pay rate: "; cin >> payRate; cout << "Enter hours: "; cin >> hoursWorked; return; } const float REG_HOURS = 40.0; const float OVER_TIME = 1.5; int main() { float hours, rate, gross; GetInput(rate, hours); gross = GrossPay(rate, hours); // display result return 0; } GrossPay() float GrossPay(float payRate, float hours) { if (hours > REG_HOURS) payRate = (hours - REG_HOURS) * OVER_TIME * payRate + REG_HOURS * payRate; else payRate = hours * payRate; return payRate; }

  3. Activation Record void GetInput(float& payRate, float& hoursWorked) { cin >> payRate; cin >> hoursWorked; return; } int main() { float hours, rate, gross; GetInput(rate, hours); . . . } hours: rate: gross: &payRate: &hoursWorked: Return Address ? ? ? 10 45 45 10 ? ? ?

  4. Activation Record float GrossPay(float payRate, float hours) { if (hours > REG_HOURS) payRate = (hours - REG_HOURS) * OVER_TIME * payRate + REG_HOURS * payRate; else payRate = hours * payRate; return payRate; } int main() { float hours, rate, gross; GetInput(rate, hours); gross = GrossPay(rate, hours); . . . } 45 10 ? hours: rate: gross: payRate: 10 hours: 45 Return Address 475 475

  5. Activation Record Out InOut In ? ? // Parameters; ( , , ) void Final(int& x, int& y, int z) { int temp; temp = z / x; z = 2 * temp - 5; x += z; y = z - x; return; } ? int main() { int num1 = 5, num2 = 9, x = 10;   Final(num1, num2, x + num2); return 0; } &x : 5 (num1) &y : 9 (num2) z : 19 Temp: ? Return Address 3 1 6 -5 num1: 5 num2: 9 X : 10 6 -5

  6. Array and typedef float Scores[9]; // an array variable typedef float arrayType[9]; // a (new) data type // a nick name for array of // 9 float elements

  7. 2-D Array and typedef typedef float arrayType[9]; arrayType Scores; // Array of float with 9 elements arrayType allScores[10]; // Array of arrays // 2-D array // Same as float allScores[10][9];

  8. 2-D Array as Function Parameter float rowAverage(const float nums[][MAX_COLS], int rowIndex, int numCols); // Must specify MAX_COLS! // nums[] is an array // Data Type of array elements: // an array of MAX_COLS floats

  9. 2-D Array as Function Parameter const int MAX_COLS = 9; typedef float arrayType[MAX_COLS]; float rowAverage(const arrayType nums[], int rowIndex, int numCols); // nums[] is an array // Data Type of array elements: arrayType // an array of MAX_COLS floats float rowAverage(const float nums[][MAX_COLS], int rowIndex, int numCols); // Must specify MAX_COLS! // Must specify data type of array elements!

  10. 2-D Array and Array of Array typedef float arrayType[9]; arrayType allScores[10]; // To understand float allScores[10][9]; // To code

  11. 2-D Array and Array of Array float rowAverage(const float nums [], int numCols); float arrayAverage(const float nums [][MAX_COLS], int numRows, int numCols); float nums[MAX_ROWS][MAX_COLS]; float Average; Average = rowAverage(nums[row], cols); // Passing one row as an array Average = arrayAverage(nums, rows, cols); // Passing the entire 2-D array

  12. Schedule • Quiz9-4: 5 points Due 5 pm, Monday • Prog6 Due Wednesday Grace Friday Fix Prog5 errors C-String for C++ String Selection Sort

  13. Final Exam • 7:00 – 8:52 PM • Thursday, May19, 2011 • Doudna 103 • 100 Points • Comprehensive • #2 pencil

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