The Foundation of Programming: A Gentle Introduction to C

C language basics: variables and types: Define variables to store data, and type specifies the type of data stored. Input and output: printf() outputs to the screen, scanf() reads user input. Operators: Use arithmetic and comparison operators to perform operations and comparisons. Control flow: if-else and switch-case are used to selectively execute code, and loops are used to repeatedly execute code. Functions: Define and call functions to perform specific tasks, passing parameters by value or by reference. Array: Stores a collection of values ​​of the same type. You can access elements using indexes and create multi-dimensional arrays. Practical case: Calculating the Fibonacci sequence

Basics of programming: A preliminary exploration of C language

C language is a structure It is a process-oriented programming language that is widely used due to its high efficiency and easy portability. This article will take you on a journey of C language programming, from basic syntax to practical cases, to gradually master the essence of C language.

1. Getting started

• Variable declaration and data type: Variables are used to store data, and their type determines the stored data type.
• Output Input: The printf() function is used to output on the screen, while the scanf() function is used to read user input.
• Arithmetic operators: , -, *, /, %, etc. are used to perform arithmetic operations.
• comparison operators: 68d687f5a0cabed7ef4cbdc5e9d691b0, ==, !=, etc. are used to compare the size of two values.

2. Control flow

• if-else statement: is used to execute different code blocks based on conditions.
• switch-case statement: is used to execute different code blocks according to different situations.
• Loop statements: while, do-while, for are used to repeatedly execute code blocks.

3. Function

• Function declaration: Define function name, parameters and return value type.
• Function call: Call a function using its name and parameters.
• Parameter passing: Function parameters can be passed by value or by reference.

4. Array

• Array declaration: is used to store a collection of values ​​of the same type.
• Array access: Use array index to access array elements.
• Multi-dimensional arrays: You can create multi-dimensional arrays to form matrices or more complex data structures.

Practical case: Calculating the Fibonacci sequence

The following C language code calculates the Fibonacci sequence:

#include <stdio.h>

int fibonacci(int n) {
  if (n == 0)
    return 0;
  else if (n == 1)
    return 1;
  else
    return fibonacci(n - 1) + fibonacci(n - 2);
}

int main() {
  int n;
  printf("请输入斐波那契数列的项数：");
  scanf("%d", &n);

  for (int i = 0; i < n; i++) {
    printf("第 %d 项：%d\n", i + 1, fibonacci(i));
  }

  return 0;
}

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