﻿ Exercise 5 - Learning C through Suffering
C language learned by suffering

Exercise 5

fundamental knowledge

Q1-1
What do you call naming a memory that stores numerical values?

Q 1-2
What do you call storing a number in the above location?

Q1-3
What do you call increasing the value of the above location by 1?

How would the following program appear when executed?

Q2-1
`````` #include <stdio.h>

int main(void)
{
int x, y;

x = 10;
y = x * 10 + 20;
printf("%5d\n", y);

return 0;
}``````

program writing

Q3-1
Buy one soft drink for 198 yen per bottle and two bottles of milk for 138 yen per bottle.
Find the change if the customer pays with a 1,000 yen bill.
However, add 5% consumption tax and the amount of change should be an integer.
You may or may not round off the consumption tax.

descriptive expression

Q4-1
3.14 * 12, and the computation by real numbers and integers, the answer is treated as a real number, briefly explain why.

Basic Knowledge (sample answers)

Solution 1-1
Variable Declaration

*The variable alone is correct.

Solution 1-2
assignment

Solution 1-3
increment

Program reading (example solution)

Solution 2-1
120

*%5d designation, so there will be a two-digit space in the front part.
Program writing (example of solution)

Solution 3-1
`````` #include <stdio.h>

int main(void)
{
int juice, milk, money, payment, change;
double tax;

Juice = 198;
milk = 138;
money = 1000;
tax = 1.05;

payment = (int)((juice + milk * 2) * tax);
change = money - payment;

printf("%d yen\n", change);

return 0;
}``````

Solution 2-1
503 yen

It is possible to solve without using *variables, but it is easier to change them later if they are used.
*Points shall be deducted if the cast conversion is forgotten.
*Points will also be deducted if the answer is a real number.
*Answers differ slightly depending on the calculation method.