Starting out with c from control structures through objects brief version 9th edition gaddis solutio

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Answers to Review Questions Chapter 7 1.

The size declarator is used in a definition of an array to indicate the number of elements the array will have. A subscript is used to access a specific element in an array.

The array has 10 elements.

The subscript of the first element is 0.

The subscript of the last element is 9.

Using four-byte integers, this array uses 40 bytes of memory.

Because, with the array alone the function has no way of determining the number of elements it has.

2 14 8 By providing an initialization list. The array is sized to hold the number of values in the list.

3 0 Because an array name without brackets and a subscript represents the array's beginning memory address. The statement shown attempts to assign the address of array2 to array1, which is not permitted.

No. By reference.

The array's beginning memory address.

By using the same subscript value for each array.

Eight rows Ten columns Eighty elements sales[7][9] = 123.45; The second size declarator, which is for the number of columns.

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You do not have to declare the number of elements that a vector will have.

If you add a value to a vector that is already full, the vector will automatically increase its size to accommodate the new value.

A vector can report the number of elements it contains. size declarator integer, 0 subscript 0 size declarator, subscript bounds initialization 0 initialization list

Starting Out with C++: From Control Structures through Objects, 9/e

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subscript = an address address, or name multi-dimensional rows, columns two braces column Standard Template Library (or STL) sequence and associative sequence vector push_back size pop_back clear

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const int SIZE = 20; for (int i = 0; i < SIZE; i++) cout << names[i] << endl;

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const int SIZE = 100; for (int i = 0; i < SIZE; i++) numberArray2[i] = numberArray1[i];

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const int SIZE = 10; int id[SIZE]; // To hold ID numbers double weeklyPay[SIZE]; // To hold weekly pay // Display each employee's gross weekly pay. for (int i = 0; i < SIZE; i++) { cout << "The pay for employee " << id[i] << " is $" << fixed << showpoint << setprecision(2) << weeklyPay[i] << endl; }

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const int ROWS = 30, COLS = 10; int grades[ROWS][COLS];

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const int SIZE = 12; const int NAME_SIZE = 25; // A 2D array to hold the country names char countries[SIZE][NAME_SIZE];

Starting Out with C++: From Control Structures through Objects, 9/e

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// An array to hold populations long populations[SIZE]; // Display each country's name and population. for (int i = 0; i < SIZE; i++) { cout << "The population of " << countries[i] << " is " << populations[i] << endl; } 46.

No, the correct sum will not be printed for numberArray2 because the accumulator (total) is not set back to zero before the second loop executes.

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numberArray[0][0] = 145; numberArray[8][10] = 18;

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const int ROWS = 10; const int COLS = 20; int row, col; // Loop counters float total = 0.0; // Accumulator // Sum the values in the array. for (row = 0; row < ROWS; row++) { for (col = 0; col < COLS; col++) total += values[row][col]; }

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const int NUM_ROWS = 29; const int NUM_COLS = 5; int row, col, // Loop counters total; // Accumulator // Display the sum of each row. for (row = 0; row < NUM_ROWS; row++) { // Set the accumulator. total = 0; // Sum a row. for (col = 0; col < NUM_COLS; col++) total += days[row][col]; // Display the row's total. cout << "The total for row " << row << " is " << total << endl; } // Display the sum of each column. for (col = 0; col < NUM_COLS; col++) { // Set the accumulator.

Starting Out with C++: From Control Structures through Objects, 9/e

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total = 0; // Sum a column. for (row = 0; row < NUM_ROWS; row++) total += days[row][col]; // Display the column's total. cout << "The total for column " << col << " is " << total << endl; } 50.

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false true true false true false true true false true true false false false false true false true true true true true false false true false true true false true

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The size declarator cannot be a variable.

The size declarator cannot be negative.

The loop will write data past the end of the array.

The initialization list must be enclosed in braces.

Two of the initialization values are left out.

For the array to be implicitly sized there must be an initialization list.

A null terminator must be specified in the initialization list.

Starting Out with C++: From Control Structures through Objects, 9/e

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The assignment operator cannot be used to assign the contents of one array to another, in a single statement.

The parameter should be declared as int nums[]. Also, the function should have a parameter to hold the size of the array.

The parameter must specify the number of columns, not the number of rows.

You do not use an = operator before the initialization list.

Starting Out with C++: From Control Structures through Objects, 9/e

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