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Introduction to
C Language

C language
in the browser

Handy App
Read it right next to your computer.
Book version bitter C
Read it right next to your computer.
Book version bitter C
Read it right next to your computer.
Book version bitter C
Read it right next to your computer.
Book version bitter C
learn through sufferingC Language
learn through sufferingC Language

Practice Problem 9

Fundamentals

Question 1-1
What is the colloquial name for the variable used to count repetitions in a for loop?


Question 1-2
What do we colloquially call a `for` loop that runs forever?

Program reading
What is the purpose of the following program?
Determine the answer based on the processing content and variable names.

Question 2-1 
#include <stdio.h>

int main(void)
{
    int i, price;

    scanf("%d", &price);

    for (i = 1; i <= 9; i++) {
        printf("%d Price Down = %d\n", i, (int)(price * ((10.0 - i) / 10)));
    }

    return 0;
}

Program Manual

Question 3-1
Write a program that uses a for loop to display a multiplication table.

Hint: Use the %2d specifier to align tables.
Hint: You can use a for loop inside another for loop.

descriptive

Question 4-1
Briefly explain how a for loop with a constant number of iterations works.

Fundamentals (Answer Key)

Solution 1-1
Count variable or loop variable


Solution 1-2
Infinite loop

Program Reading (Solution Example)

Solution 2-1
A program that displays prices with discounts ranging from 1% to 9% when a fixed price is entered.

"The discount rate is calculated by dividing 10.0 by i, and then dividing the result by 10."
Program Documentation (Example Solution)

Question 2-1 
#include <stdio.h>

int main(void)
{
    int x, y;

    for (x = 1; x <= 9; x++) {
        for (y = 1; y <= 9; y++) {
            printf(" %2d ", x * y);
        }
        printf(" \n");
    }
    
    return 0;
}

printf("\n");
"You can use `for` loops as well as other blocks (compound statements) in any level of nesting."
　However, please pay attention to code readability.
descriptive (answer)

Solution 4-1
初めにvariableに1を入れ、そのvariableを毎回1ずつ増やしていき、
variableの値が繰り返し回数より大きくなったHourにループを終えることで、
It achieves a constant number of loops.



About This Site

Learning C language through suffering (Kushi C) is
This is the definitive introduction to the C language.
It systematically explains the basic functions of the C language.
The quality is equal to or higher than commercially available books.

Part 0: Program Overview
  1. What is a program?
Chapter 1: The World's Smallest Program
  1. A do-nothing program.
  2. A compiler is a translation software.
  3. Practice Problem 1
Chapter 2: How to Write Programs
  1. Rules of Writing
  2. Conventions of writing
  3. Practice Problem 2
Chapter 3: Displaying on the Screen
  1. String Display
  2. newline character
  3. Practice Problem 3
Chapter 4: Displaying and Calculating Numbers
  1. Display of numbers
  2. Basic calculations
  3. Numeric types
  4. Practice Problem 4
Chapter 5: Numerical Memory and Calculation
  1. Memorizing numbers.
  2. Types of Variables
  3. Type conversion
  4. Number formatting
  5. Practice Problem 5
Chapter 6: Input from the Keyboard
  1. input function
  2. The fear of input
  3. Practice Problem 6
Chapter 7: Comparison and Judgment
  1. Comparative sentences
  2. Comparison operators
  3. Execution of multiple processes
  4. Problem 7
Chapter 8: Performing Case-by-Case Processing
  1. Two cases
  2. Cases with three or more possibilities.
  3. Case by case basis
  4. Practice Problem 8
Chapter 9: Repeating a Fixed Number of Times
  1. Iterative sentence
  2. How Loops Work
  3. Practice Problem 9
Chapter 10: Repeating Without Knowing the Number of Times
  1. Unspecified loop
  2. Input validation
  3. Practice Problem 10
Chapter 11: How to Create Functions
  1. Creating custom functions
  2. Passing a number to a function.
  3. Return a number from a function.
  4. Practice Problem 11
Chapter 12: Variable Lifetime
  1. Variables with limited scope
  2. The last variable standing
  3. Variables that survive within a function
  4. Practice Problem 12
Chapter 13: Handling Multiple Variables at Once
  1. Handling multiple variables collectively.
  2. Arrays
  3. Practice Problem 13
Chapter 14: How to handle strings
  1. Handling Characters
  2. Ways to handle strings
  3. String manipulation functions
  4. Practice Problem 14
Chapter 15: How Pointer Variables Work
  1. The Mechanism of Memory
  2. Variables and Memory
  3. &付けが必要なvariableの正体
  4. Variable to store an address
  5. Let's try using pointer variables.
  6. Passing information through arguments
  7. &The Peculiar Relationship Between Arrays and Pointers
  8. Practice Problem 15
Chapter 16: Combining Multiple Types
  1. Combining variables of different types.
  2. Structure arguments
  3. Array of Structures
  4. Practice Problem 16
Chapter 17: Handling Files
  1. Reading and writing text files
  2. Reading and writing binary files
  3. Drug response
  4. Practice Problem 17
Chapter 18: Macro Functions
  1. Handling Immutable Values
  2. Constants by other means
  3. Implementing simple functions.
  4. Practice Problem 18
Chapter 19: Dynamic Arrays
  1. Create arrays freely.
  2. Practice Problem 19
Chapter 20: Multiple Source Files
  1. Minimal partitioning
  2. The Divide Principle
  3. Practice Problem 20