Question

CODE A

#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#define PI 3.14159265358979323846
int main(){
int diameter;
printf("Enter value of diameter between 8 to 60 inches: ");
scanf("%d",&diameter);
// if(diameter>60 || diameter<=8){
// printf("Error! invalid input");
// exit(0);
// }
// else{
// float radius = diameter/2;
// float volume = (4/3)*PI*radius*radius*radius;
// printf("%.2f",volume);
// }

//check through the while loop if it is valid or in valid
while(diameter>60 || diameter<=8){
printf("Invalid input Enter again: ");
scanf("%d",&diameter);
}
  
//caluclate the volume of sphere
float radius = diameter/2;
float volume = (4/3)*PI*radius*radius*radius;
printf("%.2f",volume);
  
return 0;
}

CODE B

#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#define PI 3.14159265358979323846
int main(){
int diameter;
printf("Enter value of diameter between 8 to 60 inches: ");
scanf("%d",&diameter);
// if(diameter>60 || diameter<=8){
// printf("Error! invalid input");
// exit(0);
// }
// else{
// float radius = diameter/2;
// float volume = (4/3)*PI*radius*radius*radius;
// printf("%.2f",volume);
// }

//check through the while loop if it is valid or in valid
while(diameter>60 || diameter<=8){
printf("Invalid input Enter again: ");
scanf("%d",&diameter);
}
  
//caluclate the volume of sphere
float radius = diameter/2;
float volume = (4/3)*PI*radius*radius*radius;
printf("%.2f",volume);
  
return 0;
}

CODE C

#include <stdio.h>
#include<stdlib.h>

int main()
{
int num;
FILE *fptr;

// use appropriate location if you are using MacOS or Linux
fptr = fopen("epquakes.txt","r");

// if fptr is null means file not exists
if(fptr == NULL)
{
printf("Error!");   
exit(1);   
}

// c for coutn and invalid count
int c = 0, invalid = 0;
// iterate with while loop until end of file
while((fgetc(fptr)) != EOF )
{
double num;
  
//scan the float values
fscanf(fptr,"%lf",&num);
  
//check for above 3.0
if(num>3.0){
c++;
}
  
//check for invalid values
if(num<0.0){
invalid++;
}
}
//print output
printf("Total count above 3.0 is %d\n Total invalid data is %d",c,invalid);
fclose(fptr);

return 0;
}

For each code write:

-Inputs

-Outputs

-Formulas used (include explanation, units, definition of any constants, and any sketches)

-Assumptions/Pre-conditions (ex: valid/invalid inputs, restrictions, factors disregarded)

-Algorithm

-Example worked by hand (may include sketches)

-Test Plan: Included your test plan

-Evaluation/ Conclusions based on program execution

Answer 1

A&B are same codes for finding the volume of a sphere

Inputs :

• diameter in integer data type.

Outputs :

• volume in float data type, the volume of the sphere.

Formuals used :

• radius = diameter/2
• volume = (4/3)*PI*radius*radius*radius

Assumption/Precondition :

• The diameter should be greater than 8 and less than 60

Algorithm:

1. Start
2. Initialize int diameter, decalre PI, float volume, float radius
3. Read diameter
4. If (diameter >60 || diameter<=8)
   1. Print ("Invalid input")
5. else
   1. radius = diameter/2;
   2. volume = (4/3)*PI*radius*radius*radius;
   3. print volume
6. while (diameter >60 || diameter<=8)
   1. print ("Invalid input Enter again:")
   2. Read diameter
   3. radius = diameter/2;
   4. volume = (4/3)*PI*radius*radius*radius;
   5. print volume
7. stop

Example:

Enter value of diameter between 8 to 60 inches:

61

Invalid input Enter again:

10

4188.78

Test plan :

• Trying different numbers which are not in the list
• Checking the complxity of program

Evaluation:

• The program can be simplified further
• Same calculation is written two times. This can be avoided using conditional statements

Code C

Inputs :

• file name (in code)
• num value

Outputs :

• Total count value above 3.0
• Total invalid count

Formuals used :

• Conditional statement and increment only

Assumption/Precondition :

• Checking whether the file is there or not
• Checking num value greater than or less than 3

Algorithm:

1. Start
2. Initialize num, file pointer, c=0, invalid=0;
3. Point and open file epquakes.txt
4. If pointer is null
   1. Print error
5. while pointer is not at end of the file, ((fgetc(fptr)) != EOF )
   1. Initialize double num;
   2. Read num;
   3. If (num>3.0)
      1. Increment c by one, (c++)
   4. If(num<0.0)
      1. Increment invalid by one, (invalid++)
   5. End while
6. Print ("Total count above 3.0 is %d\n Total invalid data is %d",c,invalid);
7. Close file
8. Stop

Example:

7

4.5

1

-1

-2

-8

Total count above 3.0 is 2

Total invalid data is 3

Test plan:

• Testing with pointing to null address
• Testing maximum numbers
• Testing negatives and floats

Evaluation:

• The program can be simplified to more readable form for eeasy understanding.