Assignment Instructions
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Edit, compile, and run the following program on the UH UNIX shell:
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Write a program with a main() function and the following five (5) functions definitions (and corresponding function prototypes and function calls).
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You will be inputting numbers, so at the top of your program, include the getdouble.h header file:
#include "getdouble.h"
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Ask the user to "Enter two positive integers, separated by a space, the first smaller than the second".
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Use function
getdouble()
twice to get the two integers from the user. For example:
int first = (int)getdouble();
int last = (int)getdouble();
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Do NOT use function scanf(), because it is easy for someone to crash your program with this function.
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Do some error checking on the input.
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Use recursion to display the integers from the first integer to the second integer. The return type should be "void".
Use printf() statements in your function to display the integers.
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Use recursion to add the sum of the integers from the first integer to the second integer. The return type should be "int". Display the result in main().
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Use recursion to multiply the product of the integers from the first integer to the second integer. The return type should be "int".
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Use recursion to calculate the first integer to the power of the second integer. The return type should be "int". Display the result in main(). Please do NOT use the C library pow() function.
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Use recursion to calculate the GCD (greatest common divisor) of the first integer and the second integer.
The GCD is the largest integer that divides both x and y.
The base case is: if y is equal to 0, then the return value is x.
The recursive case is: The return value is gcd(y, x%y).
The return type should be "int".
Display the result in main().
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Email your makefile and C program to the instructor, or show it to the instructor in class.
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For the submission guidelines and the grading guidelines, see the syllabus.
Example I/O
Enter two positive integers, separated by a space, the first smaller than the second: 5 1
ERROR: 5 is not smaller than 1
Enter two positive integers, separated by a space, the first smaller than the second: -1 5
ERROR: both numbers must be positive
Enter two positive integers, separated by a space, the first smaller than the second: 1 5
Counting from 1 to 5: 1 2 3 4 5
The sum of 1 to 5 = 15
The product of 1 to 5 = 120
1 to power of 5 = 1
The GCD of 1 and 5 = 1
Counting from 2 to 6: 2 3 4 5 6
The sum of 2 to 6 = 20
The product of 2 to 6 = 720
2 to power of 6 = 64
The GCD of 2 and 6 = 2
Counting from 6 to 9: 6 7 8 9
The sum of 6 to 9 = 30
The product of 6 to 9 = 3024
6 to power of 9 = 10077696
The GCD of 6 and 9 = 3
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