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On a piano, a key has a frequency, say f0. Each higher key (black or white) has a frequency of f0 * rn, where n is the distance (number of keys) from that key, and r is 2(1/12). Given an initial key frequency, output that frequency and the next 4 higher key frequencies. Output each floating-point value with two digits after the decimal point, which can be achieved as follows: print('%0.2f %0.2f %0.2f %0.2f %0.2f' % (your_value1, your_value2, your_value3, your_value4, your_value5))

Respuesta :

alimir

Answer:

#include <stdio.h>

int main()

{

float your_value1, your_value2, your_value3, your_value4, your_value5;

printf("Enter a frequency: ");

scanf_s("%f", &your_value1);//storing initial key frequency in your value 1

 

float r = 2.0 / 12;//typing 2.0 so it is treated as float and not int

your_value2 = your_value1 * r * 1; //initial*r*n

your_value3 = your_value1 * r * 2; //initial*r*n

your_value4 = your_value1 * r * 3; //initial*r*n

your_value5 = your_value1 * r * 4; //initial*r*n

printf("%0.2f %0.2f %0.2f %0.2f %0.2f", your_value1, your_value2, your_value3, your_value4, your_value5);

return 0;

}

Explanation:

The purpose of this exercise is to make you understand the difference between float and int. float variables are used when you need decimals in your calculations. int is used when you need integers. The problem in this exercise was the formulation of r. Now r is = 2/12, this means that when we type r as that, the computer assumes that it is an integer and treats it as such. So, it will convert the 0.166667 into 0. To overcome this, all you have to do is type 2.0 instead of 2 alone.

The %0.2 command restricts the float variable to 2 decimal places. By default, it has 6 decimal places.

I have used the function scanf_s instead of scanf simply because my compiler does not work with scanf.

MrRoyal

The programming language is not stated. So, I will answer this question using java programming language. The program uses while-loop to iterate through the keys of the piano.

The program in java is as follows, where comments are used to explain each line.

import java.util.Scanner;

import java.lang.Math;

public class Main {

public static void main(String args[]) {

Scanner input = new Scanner(System.in);

//This declares f0 and initializes r. f0 represents the frequency, while r represents 2^(1/12)

float f0; double r= Math.pow(2,(1.0/12.0));;

//This prompts the user for f0

System.out.print("f0: ");

//This gets input for f0

f0 = input.nextFloat();

//This initializes the number of keys to 1

int numkey = 1;

//This prints the initial frequency, f0

System.out.print(f0+" ");

//The following while loop is repeated 4 times  

while(numkey<=4){

//This calculates the next frequency

f0*=r;

//This prints the calculated frequency

System.out.print(f0+ " ");

//This increments the number of key by 1

numkey++;

}  }  

//The program ends here

}

Read more about loops at:

https://brainly.com/question/16954895

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