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- ECS30 Programming Assignment #3

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Problem 1: squareroot.c (40 points, 4 per test case)

In this program you will approximate the square root of a number n using the Babylonian

method. This method starts with an initial guess x0 close to √

n, and at the n

th step

calculates xn =

1

2

(xn +

n

xn

). As n gets larger an larger, xn ≈

√

n. Your program must

take the number n, initial guess x0, and number of steps m and print xm with exactly 5

decimal places.

[rsgysel@pc17 ˜]$ ./squareroot

Enter the integer you wish to find the square root of: 2

Enter your first guess and number of steps: 1 1000

The square root of 2 is approximately 1.41421

[rsgysel@pc17 ˜]$ ./squareroot

Enter the integer you wish to find the square root of: 2

Enter your first guess and number of steps: 1 1

The square root of 2 is approximately 1.50000

[rsgysel@pc17 ˜]$ ./squareroot

Enter the integer you wish to find the square root of: 5

Enter your first guess and number of steps: 2 100

The square root of 2 is approximately 2.23607

∗Last updated January 22, 2017

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Problem 2: guessyournumber.c (70 points, 7 per test case)

Write a program that will guess an integer that the user has picked. Imagine that the user

will write down a positive integer x on a piece of paper and your program will repeatedly

ask questions in order to guess what x is, and the user replies honestly. Your program

will start by asking for an int n, and you must have 1 ≤ x ≤ n. After that, the program

will successively guess what x is, and the user must tell the computer if x is equal to

the guess (entering ’e’), larger than the guess (entering ’l’), or smaller than the guess

(entering ’s’).

Your program will guess by maintaining a lower bound (initially 1) and upper bound

(initially n) and pick the largest integer equal to or smaller than1

the midpoint of the

lower bound and upper bound. If the user responds with ’l’ indicating that x is larger,

the guess becomes the new lower bound plus one. If the user responds with ’s’ indicating

that x is smaller, the guess becomes the new upper bound minus one. If the user responds

with ’e’ indicating that x is the guess, your program will report the number of guesses

made and terminate execution:

[rsgysel@pc17 ˜]$ ./guessyournumber

Enter n: 50

Is your number 25? l

Is your number 38? l

Is your number 44? s

Is your number 41? e

Your number must be 41. I used 4 guesses.

If the user responds in a way that is not feasible (no such x can exist), print an error

and quit:

[rsgysel@pc17 ˜]$ ./guessyournumber

Enter n: 9

Is your number 5? s

Is your number 3? s

Is your number 2? l

Error: that’s not possible.

If only one number is still possible, your program should conclude what it is and report

the number of guesses:

[rsgysel@pc17 ˜]$ ./guessyournumber

Enter n: 50

Is your number 25? l

Is your number 38? l

Is your number 44? s

Is your number 41? s

Is your number 39? l

1This is called the floor of a number.

2

Your number must be 40. I used 4 guesses.

Report invalid input as follows:

[rsgysel@pc17 ˜]$ ./guessyournumber

Enter n: -2

Error: n must be positive.

Enter n: a

Error: invalid input.

Enter n: 9

Is your number 5? m

Error: invalid input.

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