看完下表就明白啦！
| 软件产品 | 编写语言 |
| original UNIX | C |
| Linux | C |
| Microsoft Windows | 汇编、C、C++ |
| Apple macOS | C、C++ |
| HP-UX | C |
| SunOS | C |
| Apple iOS | C、C++ |
| Google Android | C、C++、Java |
| Amazon Kindle OS | C |
| Microsoft Windows UI | C++ |
| Apple macOS UI | C++ |
| Microsoft Office | 汇编、C、C++逐步过渡 |
| Adobe Acrobat Reader/Distiller | C++ |
| Adobe Photoshop | C++ |
| Oracle database | 汇编、C、C++、Java |
| MySQL | C、C++ |
| Microsoft SQL Server | 汇编、C、C++逐步过渡 |
| IBM DB2 | 汇编、C、C++ |
| Microsoft Edge/IE | C++ |
| Mozilla Firefox | C++ |
| Google Chrome | C++ |
| Google Search Engine | 汇编、C++ |
| Microsoft Visual Studio | C++、C# |
| Microsoft .Net CLR | C++ |
| Java Virtual Machine | C++ |
| facebook web site | C++ |
| Amazon web site | C++、Java |
| PayPal web site | C++ |
| eBay web site | 从C++过渡到Java |
| Microsoft Visual C++ compiler | C++ |
| gcc compiler | C++ |
| Apache web server | C、C++ |
| Microsoft IIS web server | C++ |
结论：毫无疑问，堪称两大主流语言，各有所长。对于操作系统、微控制器系统以及嵌入式处理器系统的开发，C适合底层、内核级，速度更快，占比更高，必不可少，而C++适合高层、界面级。对于数据库系统、编译器与解释器、平台与虚拟机以及各类其它应用程序的开发，C++占比更大。