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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

Problem 7

Fundamentals

Question 1-1
What do we call numbers other than zero when making conditional judgments?


Question 1-2
What do we call 0 when it's used in conditional judgment?


Question 1-3
What do we call enclosing multiple sentences with {}?

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 value, rest;

    scanf("%d", &value);

    rest = value % 2;

    if (rest == 0) printf("E");
    if (rest == 1) printf("O");

    printf("\n");

    return 0;
}

Program Manual

Question 3-1
西暦yearを入力すると、そのyearにオリンピックが開かれるか、
Create a program to display.
If possible, it would be even better to display the distinction between summer and winter.
Hint: The Sydney Olympics (Summer) were held in 2000.

※条件がややこしくなるので、
"Let's disregard the times when summer and winter were in the same year."

descriptive

Question 4-1 
if (-1) printf("OK\n");

When the program is executed, OK appears, but…
Explain it briefly.
Fundamentals (Answer Key)

Solution 1-1
True or true.


Solution 1-2
Fake or false


Solution 1-3
Block or compound sentence

Program Reading (Solution Example)

Solution 2-1
Display whether the input is odd or even.

※ O is an abbreviation for odd, and E is an abbreviation for even.
% calculates the remainder.
"Note: The final printf function is only for adding a newline."
Program Documentation (Example Solution)

Solution 3-1 
#include <stdio.h>

int main(void)
{
    int year;

    printf("西暦yearを入力して下さい:");
    scanf("%d", &year);

    if (year % 4 == 0) printf("夏季五輪\n");
    if (year % 2 == 0 && year % 4 != 0) printf("冬季五輪\n");
    if (year % 2 != 0) printf("五輪None\n");

    return 0;
}

"Here, the years in which the Olympics are held are divisible by 2."
"It also leveraged the fact that the Summer Olympics occur every four years."
"※Other calculation methods may be possible, so if you arrived at the answer through calculation, it will be considered correct."
"Incorrect answers will be given if you compare years directly without performing any calculations."
問題
descriptive (answer)

Solution 4-1
if文では、0以外のnumericsはすべて真と見なすので、
たとえ負の値であってもrunするから。



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