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C++ ch9 extra
| Question | Answer |
|---|---|
| What two reasons do programmers use functions for? | (1) so there is less duplication of code(2) to allow large and complex programs to be broken into small and manageable tasks. |
| The main function returns its one value to the ___. | oeprating system. |
| The ___ function returns a string of characters entered by the user at the keyboard. | getline() |
| The ___ function returns the uppercase equivalent of a string. | toupper() |
| What is the syntax of the pow function? Explain. | pow(x, y)x is the number you want raised to power y. |
| To use the pow function ins a program, the program must contain the __ directive? | #include <cmath> |
| cube = pow(4.0, 3) Explain | The double 4.0 is raised to the third power(4.0 * 4.0 * 4.0) and the answer is assigned to the cube variable. |
| What is the syntax to specifiy the range of a random number? Write the formula for a range of 1 -6 | lowerbound + rand() % (upperbound - lowerbound + 1)1 + rand() % (6 - 1 + 1); |
| Show and explain the syntax of the srand function. | srand(seed)seed is an integer that represents the starting point for the random number generator. |
| Most C++ programmers use the built-in __ function as the -seed-. | time() |
| A program uses the statement discount = calcDisc(300.45); to call the calcDisc functions, which returns a number having a decimal place. Which is a valid function header for the calcDisc function? | double calcDisc(double sales) |
| Most C++ programmers enter the function definition where? | below the main function in a program. |
| A function prototype can be thought of as the ? | table of contents in a book. (simply a preview of what will be expanded on later) |
| What is the syntax of a function prototype? Give an example. | returnDataType functionName(parameterList);int calcRectangleArea(int, int); |
| What is the difference between a function header and a function prototype? | (1) A function prototype ends with a semicolon.(2)The function header contains both the data type and name of each formal paramter, but the function prototype contains only the data type. |
| The function prototype is necessary only when ? | the function is defined after the main() function. |
| The formal parameters are defined in the ? | function definitions |
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kat1350
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