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GMIT Programming and Coding
Functions
Exercise #1
Write a function named toSeconds which takes three integer parameters, a number of
hours, number of minutes, and number of seconds and returns the total number of
seconds. The prototype should look like.
int toSeconds(int hours, int minutes, int seconds);
As always, use good indentation and meaningful identifier names. For example,
cout << toSeconds(0, 2, 15);
would print 135, the total number of seconds in 0 hours, 2 minutes and 15 seconds.
Exercise #2
Given this main program:
int main() {
float temperature;
while (cin >> temperature) {
printTempOpinion(temperature);
}
return 0;
}
Write the function printTempOpinion which prints "Cold" on cout if the temperature is
below 70, "OK" if the temperature is in the range 70-80, and "Hot" if the temperature is
above 80.
Exercise #3
Write a function named toMeters which takes two float parameters, a number of feet and
a number of inches and returns the floating point number of equivalent meters. Assume
there are 2.54 centimeters (0.0254 meters) in one inch. Write only the function.
Sample Usage
cout << toMeters(5, 11);
This would print 1.8034, the number of meters in 5 feet, 11 inches.
Exercise #4
Write a function named average3 which returns the average of its three floating-point
parameters. As always, use good indentation. You do not need to write the main program.
Write only the function.
For example,
cout << average3(7, 2, 6);
This would print 5.0, which is (7+2+6)/3.
GMIT Programming and Coding
Functions
Exercise #5
Write a function named promptYN which takes one string parameter. It prints the string
(which is a question the caller supplies) on cout, then prompts the user to enter Y or N. It
then reads one character from cin. If the character is a 'Y', the function returns true, if the
character is a 'N', it returns false, if the characer is neither of the above, your function
should prompt the user again for a 'Y' or 'N' and read another character, continuing with
this until a Y or N is entered. The prototype should be the following.
bool promptYN(string question);
Sample Usage
For example,
while (promptYN("Do you want to continue")) . . .
would continue executing the loop as long as the user answered Y.
Exercise #6
Write a function integerpower ( base, exponent ) that returns the value of:
base exponent
For example, integerpower ( 3, 4 ) = 3 * 3 * 3 * 3. Assume that exponent is a positive,
non-zero integer and that base is an integer. The function integerpower should use for or
while loops to control the calculation. Do not use any math library functions.
Write a program that calls the function and prints a table of powers (squared and cubed)
for the intergers 1 to 10.
Number
Squared
Cubed
1
1
1
2
4
8
3
9
27
...
Exercise #7
Define a function hypotenuse that calculates the length of the hypotenuse of a right triangle when the other two sides are given. Use this function in a program to determine the
length of the hypotenuse for each of the triangles shown below. The function should take
two double arguments and return the hypotenuse as a double.
Triangle
Side 1
Side 2
1
3.0
4.0
2
3
5.0
8.0
12.0
15.0
GMIT Programming and Coding
Functions
Exercise #8
Write a function multiple that determines for a pair of integers whether the second
integer is a multiple of the first. The function should take two integer arguments and
return true if the second is a multiple of the first, false otherwise. Use this function in a
program that inputs a series of pairs of integers.
Exercise #9
Write a program that inputs a series of integers and passes them one at a time to function
even, which uses the modulus operator to determine whether an integer is even. The
function should take an integer argument and return true if the integer is even and false
otherwise.
Exercise #10
Write a function that displays at the left margin of the screen a solid square of asterisks
whose side is specified in integer parameter side. For example, if side is 4, the function
displays the following:
****
****
****
****
Exercise #11
Modify the function created in Exercise 10 to form the square out of whatever character
is contained in character parameter fillCharacter. Thus, if side is 5 and fillCharacter is
"#," then this function should print the following:
#####
#####
#####
#####
#####
GMIT Programming and Coding
Functions
Exercise #12
Write program segments that accomplish each of the following:
a) Calculate the integer part of the quotient when integer a is divided by integer b.
b) Calculate the integer remainder when integer a is divided by integer b.
c) Use the program pieces developed in (a) and (b) to write a function that inputs an
integer between 1 and 32767 and prints it as a series of digits, each pair of which is
separated by two spaces. For example, the integer 4562 should print as follows:
4 5 6 2
Exercise #13
Implement the following integer functions:
a) Function Celsius returns the Celsius equivalent of a Fahrenheit temperature.
b) Function Fahrenheit returns the Fahrenheit equivalent of a Celsius temperature.
c) Use these functions to write a program that prints charts showing the Fahrenheit
equivalents of all Celsius temperatures from 0 to 100 degrees, and the Celsius equivalents
of all Fahrenheit temperatures from 32 to 212 degrees. Print the outputs in a neat tabular
format that minimizes the number of lines of output while remaining readable.
Exercise #14
Write a program that inputs three double-precision, floating-point numbers and passes
them to a function that returns the smallest number.
Exercise #15
An integer is said to be prime if it is divisible by only I and itself. For example, 2, 3, 5
and 7 are prime, but 4, 6, 8 and 9 are not.
a) Write a function that determines whether a number is prime.
b) Use this function in a program that determines and prints all the prime numbers
between 2 and 10,000. How many of these numbers do you really have to test before
being sure that you have found all the primes?