In programming, recursion is a powerful technique that allows a function to call itself to solve problems. C, as a classic programming language, supports the definition and use of recursive functions. This article will detail what recursion is, how to implement recursion in C, and some common application examples. What is Recursion? Recursion refers to … Read more
01 Read the following program: void swap(char *x, char *y) { char t; t=*x; *x=*y; *y=t; } main() { char *s1=”abc”, *s2=”123″; swap(s1,s2); printf(“%s,%s\n”,s1,s2); } The output of the program is A) 123,abc B) abc,123 C) 1bc,a23 D) 321,cba Answer: C Analysis: The function swap works as follows: t = *x; saves the character pointed … Read more
In the official GESP C++ Level 4 exam syllabus, there are a total of 11 key points. This article analyzes and introduces the 6th key point. (6) Master the basic ideas of recursion algorithms, the derivation of recursive relationships, and the solution of recursive problems. Review of other Level 4 key points: GESP C++ Level … Read more
01 Given that x, y, and t are all int type variables, after executing the statement: x=y=3; t=++x||++y; the value of y is ( ) A) Undefined value B) 4 C) 3 D) 2 Answer: C Explanation: The short-circuit characteristic of || (logical OR): If the expression on the left of || is true (non-zero), … Read more
📌 Problem Description Write a program to output the first n terms of the Fibonacci sequence (starting from 1, in the form of 1, 1, 2, 3, 5…). Requirements:1. Support input of any positive integer n2. Optimize time complexity to O(n)Example: Input: n=5 → Output: 1 1 2 3 5 Input: n=1 → Output: 1 … Read more
C Language Learning Guide: Have You Mastered These Core Knowledge Points?Latest C Language Learning Path for 2025 | Beginner, Intermediate, PracticalBeginner’s Guide to Avoiding Pitfalls in C Language: Avoid These 12 Devilish Details to Double Your Efficiency! Main Content C Language Functions: From Beginner to Mastery – A Comprehensive Guide In the programming universe of … Read more
Hello, I am Xiao Changhe, a technical expert navigating the world of code. Today, I want to share an introductory tutorial on Python, mainly covering functions, encapsulation, and recursion. This is a substantial resource that you should definitely bookmark. 1. Basics of Functions and Syntax Standards Functions are the core building blocks of Python programming, … Read more
Many beginners feel that learning C language becomes impossible halfway through, as they encounter several tough challenges that they cannot overcome. Consequently, many conclude that C language is too difficult and too close to the hardware level, especially those tough challenges that are hard to understand, making it difficult to proceed. Today, let’s discuss the … Read more
Introduction to Template Metaprogramming in C Language Template metaprogramming is a technique that combines programming with type systems, allowing computations to be performed at compile time. This approach can make programs more flexible and efficient. In C language, although there is no direct template mechanism, we can use macros and some techniques to achieve similar … Read more
Principles and Practice of Quick Sort Algorithm in C Language Quick sort is a highly efficient sorting algorithm widely used in various programming fields. It employs a divide-and-conquer approach, with an average time complexity of O(n log n). Let us explore the principles of quick sort and its implementation in C language. Basic Idea of … Read more