Learn to Program with C_ Learn to Program using the Popular C Programming Language ( PDFDrive )

Chapter 7 ■ Functions
A sample run is as follows:
Enter first length: 3m 75cm
Enter second length: 5m 50cm
Sum is 9m 25cm
You are encouraged to do the following:
• Modify getInt so that it works for negative integers.
• Write a function getDouble, which returns the next floating-point number
in the input. It should work even if the next number does not contain a
decimal point.
EXERCISES 7
1. Explain why functions are important in writing a program.
2. Given the function header
void test(int n)
explain carefully what happens when the call test(5) is made.
3. Given the function header
double fun(int n)
explain carefully what happens when the following statement is executed:
printf("The answer is %f\n", fun(9));
4. Given the function header
void test(int m, int n, double x)
say whether each of the following calls is valid or invalid. If invalid, state why.
test(1, 2, 3);
test(-1, 0.0, 3.5);
test(7, 2);
test(14, '7', 3.14);
5. Write a function sqr, which given an integer n, returns n2.
6. Write a function isEven, which given an integer n, returns 1 if n is even and 0 if n
is odd.
7. Write a function isOdd, which given an integer n, returns 1 if n is odd and 0 if
n is even.
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