C language does not have a built-in sum() function, but sum can be achieved by looping through arrays or using pointers. The looping method is suitable for small arrays, and it is more efficient to use pointers, especially for large arrays. Data can also be read from the file for summing, but attention should be paid to file operations and error handling. Optimizing performance can consider multi-threaded parallel computing, but both code readability and maintainability should be taken into account.
Playing sum in C language: From basic to advanced
Many beginners will ask, where is the sum
function that comes with C language? The answer is: No! C language does not have the convenient sum()
function built-in to directly sum it like Python. But this does not mean that summing in C is difficult. On the contrary, this allows us to understand the nature of programming more deeply. After reading this article, you can not only learn to efficiently summate in C language, but also improve your understanding of arrays, pointers and loops. This is the cornerstone of programming!
Let’s review the basics first. We usually use arrays to store a set of data, and accessing array elements requires indexing (starting from 0). Loop statements, such as for
loops, are powerful tools to traverse arrays. pointer? Don't be afraid, it's just a memory address, and the flexibility of using pointers can allow you to write more efficient code.
So, how to implement summing in C language? The most direct way is to loop through the array and accumulate the value of each element.
<code class="c">#include <stdio.h> int main() { int arr[] = {1, 2, 3, 4, 5}; int sum = 0; int len = sizeof(arr) / sizeof(arr[0]); // 計(jì)算數(shù)組長(zhǎng)度,這是個(gè)小技巧,記住它! for (int i = 0; i </stdio.h></code>
This code is clear at a glance, but it is only the most basic implementation. We can also use pointers to achieve this, which can avoid duplicate array indexing operations and will be more efficient when processing large arrays.
<code class="c">#include <stdio.h> int main() { int arr[] = {1, 2, 3, 4, 5}; int sum = 0; int len = sizeof(arr) / sizeof(arr[0]); int *ptr = arr; // 指針指向數(shù)組的首元素for (int i = 0; i </stdio.h></code>
After seeing this, you may think that the writing of pointers is more complicated, but it is closer to the underlying layer. Understanding it can give you a deeper understanding of memory operations. Remember, which method to choose depends on your needs and programming style, there is no absolute good or bad.
Next, let's take a look at more advanced usage. If your data is stored in a file, you need to read the data to the array first and then sum it. This requires functions related to file operations, such as fopen
, fscanf
, etc. It is also very important to handle errors, such as when the file does not exist.
Of course, you may encounter some pitfalls. For example, forgetting to initialize sum
variable, or accessing the array out of bounds will cause program errors. When debugging, printing the values ??of intermediate variables can help you quickly locate problems.
Finally, regarding performance optimization, for large arrays, considering using multi-threaded parallel computing can greatly improve efficiency. However, this requires deeper knowledge of C language, such as thread creation, synchronization, etc. Remember that the readability and maintainability of the code are also important, and try to write clear and concise code. Don't sacrifice code readability in pursuit of extreme performance. This is especially important in teamwork.
The above is the detailed content of How to use sum in C?. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undress AI Tool
Undress images for free

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Ordinary investors can discover potential tokens by tracking "smart money", which are high-profit addresses, and paying attention to their trends can provide leading indicators. 1. Use tools such as Nansen and Arkham Intelligence to analyze the data on the chain to view the buying and holdings of smart money; 2. Use Dune Analytics to obtain community-created dashboards to monitor the flow of funds; 3. Follow platforms such as Lookonchain to obtain real-time intelligence. Recently, Cangming Money is planning to re-polize LRT track, DePIN project, modular ecosystem and RWA protocol. For example, a certain LRT protocol has obtained a large amount of early deposits, a certain DePIN project has been accumulated continuously, a certain game public chain has been supported by the industry treasury, and a certain RWA protocol has attracted institutions to enter.

DAI is suitable for users who attach importance to the concept of decentralization, actively participate in the DeFi ecosystem, need cross-chain asset liquidity, and pursue asset transparency and autonomy. 1. Supporters of the decentralization concept trust smart contracts and community governance; 2. DeFi users can be used for lending, pledge, and liquidity mining; 3. Cross-chain users can achieve flexible transfer of multi-chain assets; 4. Governance participants can influence system decisions through voting. Its main scenarios include decentralized lending, asset hedging, liquidity mining, cross-border payments and community governance. At the same time, it is necessary to pay attention to system risks, mortgage fluctuations risks and technical threshold issues.

The coordinated rise of Bitcoin, Chainlink and RWA marks the shift toward institutional narrative dominance in the crypto market. Bitcoin, as a macro hedging asset allocated by institutions, provides a stable foundation for the market; Chainlink has become a key bridge connecting the reality and the digital world through oracle and cross-chain technology; RWA provides a compliance path for traditional capital entry. The three jointly built a complete logical closed loop of institutional entry: 1) allocate BTC to stabilize the balance sheet; 2) expand on-chain asset management through RWA; 3) rely on Chainlink to build underlying infrastructure, indicating that the market has entered a new stage driven by real demand.

Is DAI suitable for long-term holding? The answer depends on individual needs and risk preferences. 1. DAI is a decentralized stablecoin, generated by excessive collateral for crypto assets, suitable for users who pursue censorship resistance and transparency; 2. Its stability is slightly inferior to USDC, and may experience slight deansal due to collateral fluctuations; 3. Applicable to lending, pledge and governance scenarios in the DeFi ecosystem; 4. Pay attention to the upgrade and governance risks of MakerDAO system. If you pursue high stability and compliance guarantees, it is recommended to choose USDC; if you attach importance to the concept of decentralization and actively participate in DeFi applications, DAI has long-term value. The combination of the two can also improve the security and flexibility of asset allocation.

The role of Ethereum smart contract is to realize decentralized, automated and transparent protocol execution. Its core functions include: 1. As the core logic layer of DApp, it supports token issuance, DeFi, NFT and other functions; 2. Automatically execute contracts through code to reduce the risks of human intervention and fraud; 3. Build a DeFi ecosystem so that users can directly conduct financial operations such as lending and transactions; 4. Create and manage digital assets to ensure uniqueness and verifiability; 5. Improve the transparency and security of supply chain and identity verification; 6. Support DAO governance and realize decentralized decision-making.

The value of stablecoins is usually pegged to the US dollar 1:1, but it will fluctuate slightly due to factors such as market supply and demand, investor confidence and reserve assets. For example, USDT fell to $0.87 in 2018, and USDC fell to around $0.87 in 2023 due to the Silicon Valley banking crisis. The anchoring mechanism of stablecoins mainly includes: 1. fiat currency reserve type (such as USDT, USDC), which relies on the issuer's reserves; 2. cryptocurrency mortgage type (such as DAI), which maintains stability by over-collateralizing other cryptocurrencies; 3. Algorithmic stablecoins (such as UST), which relies on algorithms to adjust supply, but have higher risks. Common trading platforms recommendations include: 1. Binance, providing rich trading products and strong liquidity; 2. OKX,

Yes, Web3 infrastructure is exploding expectations as demand for AI heats up. Filecoin integrates computing power through the "Compute over Data" plan to support AI data processing and training; Render Network provides distributed GPU computing power to serve AIGC graph rendering; Arweave supports AI model weights and data traceability with permanent storage characteristics; the three are combining technology upgrades and ecological capital promotion, and are moving from the edge to the underlying core of AI.

Which altcoins have explosive potential in 2025? The answers are as follows: 1. In the Layer2 expansion track, Arbitrum (ARB) has been expanding rapidly, with obvious daily active users, and Optimism (OP) as an Ethereum optimization protocol continues to be adopted by large-scale protocols, which are all worth paying attention; 2. Among the DeFi protocol altcoins, Aave (AAVE) has enhanced lending logic, attracted stable capital inflows due to the new version, and Curve (CRV) maintains an advantageous position in the stablecoin exchange track and has strong competitiveness; 3. In the combination of artificial intelligence projects, Fetch.ai (FET) increases attention by integrating AI and blockchain, and Ocean Pro
