Chapter 9 - Doing math with C created by s3f - https://repl.it/Ed4H/2

Chapter 9 - Doing math with C.c

// This first sample program is to practice with using math operators 

/*

#include <stdio.h>

main()
{
  float a = 19.0; 
  float b = 5.0; 
  float floatAnswer; 
  
  int x = 19; 
  int y = 5; 
  int intAnswer; 
  
  floatAnswer = a / b; 
  printf("%.1f divided by %.1f equals %.1f\n", a, b, floatAnswer);
  
  floatAnswer = x/y; 
  printf("%d divided by %d equals %.1f\n", x, y, floatAnswer);
  
  intAnswer = a/b; 
  printf("%.1f divided by %.1f equals %d\n", a, b, intAnswer);
  
  intAnswer = x % y; 
  printf("%d modulus %d equals %d", x, y, intAnswer);
  
  return 0; 
  
}



// This second practice program asks a user for a number of tires purchased and price per tire. It then calculates a total price and adding the sales tax.

#include <stdio.h>
#define SALESTAX .06

main()

{
  int numTires; 
  float tirePrice; 
  float beforeTax;
  float netSales; 
  
  printf("How many tires did you purchase? ");
  scanf(" %d", &numTires);
  
  printf("What was the cost per tire (enter in $XX.XX format)? ");
  scanf(" $%f", &tirePrice);
  
  // Now I compute the price 
  
  beforeTax = tirePrice * numTires;
  netSales = beforeTax + (beforeTax * SALESTAX);
  
  printf("%You spent $%.2f on your tires\n\n\n", netSales);
  
  return 0; 
  
}

*/

// This last practice program claculates the average of 4 grades and alos does some other basic math 

#include <stdio.h>

main() 
{
  
  int grade1, grade2, grade3, grade4; 
  float averageGrade;
  float gradeDelta;
  float percentDiff; 
  
  grade1 = grade3 = 88; 
  
  grade2 = 79; 
  
  printf("What did you get on the fourth test?");
  printf(" (An integer between 0 and 100)");
  scanf(" %d", &grade4);
  
  averageGrade = (grade1 + grade2 + grade3 + grade4) / 4; 
  
  printf("Your average grade is %.1f.\n", averageGrade);
  
  gradeDelta = 95 - averageGrade; 
  percentDiff = 100 * ((95 - averageGrade) / 95); 
  printf("Your grade is %.1f points lower than the ", gradeDelta);
  printf("top grade in the class(95)\n");
  printf("You are %.1f percent behind", percentDiff);
  printf("that grade!\n\n\n");
  
  return 0; 
  
}