[CP:AMA] 2 C Fundamentals

Chapter 2: Programing Projects

1.

#include <stdio.h>

int main(void)
{
  printf("       *\n");
  printf("      *\n");
  printf("     *\n");
  printf("*   *\n");
  printf(" * *\n");
  printf("  *\n");

  return 0;
}

2.

#include <stdio.h>

#define PI 3.14f
#define COEFFICIENT (4.0f / 3.0f)

int main(void)
{
  float volume = 0, radius = 0;

  printf("Enter the radius of your sphere:");
  scanf("%f", &radius);

  volume = COEFFICIENT * PI * radius * radius * radius;

  printf("The volume of the sphere: %.2f\n", volume);
  
  return 0;
}

4.

#include <stdio.h>

int main(void)
{
  float amount = 0;

  printf("Enter an amount: ");
  scanf("%f", &amount);

  printf("With tax added: %0.2f\n", amount * 1.05f);

  return 0;
}

5.

#include <stdio.h>

int main(void)
{
  float x = 0;

  printf("Enter x: ");
  scanf("%f", &x);

  printf("The answer: %0.2f\n",
  3 * x * x * x * x *x +
  2 * x * x * x * x -
  5 * x * x * x -
  x * x +
  7 * x -
  6);
  
  return 0;
}

6.

#include <stdio.h>

int main(void)
{
  float x = 0;

  printf("Enter x: ");
  scanf("%f", &x);

  printf("The answer: %0.2f\n",
  ((((3 * x + 2) - 5) * x - 1) * x + 7) * x - 6);
  
  return 0;
}

7.

#include <stdio.h>

int main(void)
{
  int amount = 0;
  int bills20 = 0, bills10 = 0, bills05 = 0, bills01 = 0;
  
  printf("enter a dollar amount: ");
  scanf("%d", &amount);

  bills20 = amount / 20;
  bills10 = (amount - bills20 * 20) / 10;
  bills05 = (amount - bills20 * 20 -bills10 * 10) / 5;
  bills01 = amount - bills20 * 20 -bills10 * 10 - bills05 * 05;

  printf("$20 bills: %d\n", bills20);
  printf("$10 bills: %d\n", bills10);
  printf(" $5 bills: %d\n", bills05);
  printf(" $1 bills: %d\n", bills01);
  
  return 0;
}

8.

#include <stdio.h>

int main(void)
{
  float amount_of_loan = 0.0f;
  float interest_rate = 0.0f;
  float monthly_payment = 0.0f;
  float balance_after_first_payment = 0.0f, balance_after_second_payment = 0.0f, balance_after_third_payment = 0.0f;
  float monthly_interest_rate = 0.0f;

  printf("Enter amount of loan: ");
  scanf("%f", &amount_of_loan);
  printf("Enter interest rate: ");
  scanf("%f", &interest_rate);
  printf("Enter monthly payment: ");
  scanf("%f", &monthly_payment);

  monthly_interest_rate = interest_rate / (100.0f * 12.0f);

  amount_of_loan = (amount_of_loan) * (1.0f + monthly_interest_rate);
  balance_after_first_payment = amount_of_loan - monthly_payment;
  amount_of_loan = (amount_of_loan - monthly_payment) * (1.0f + monthly_interest_rate);
  balance_after_second_payment = amount_of_loan - monthly_payment;
  amount_of_loan = (amount_of_loan - monthly_payment) * (1.0f + monthly_interest_rate);
  balance_after_third_payment = amount_of_loan - monthly_payment;

  printf("Balance remaining after first payment: %.2f\n", balance_after_first_payment);
  printf("Balance remaining after second payment: %.2f\n", balance_after_second_payment);
  printf("Balance remaining after third payment: %.2f\n", balance_after_third_payment);

  return 0;
}