Introduction to C

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# Introduction to C

#### Yueh-Hua Tu

#### 2020.10.23

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# C compilers

### GNU compiler collection

[Wikipedia - GCC](https://en.wikipedia.org/wiki/GNU_Compiler_Collection)

### Clang, based on LLVM

[Wikipedia - clang](https://en.wikipedia.org/wiki/Clang)

### MS Visual C++

[Wikipedia - Microsoft Visual C++](https://en.wikipedia.org/wiki/Microsoft_Visual_C%2B%2B)

### Intel C++ compiler

[Wikipedia - Intel C++ Compiler](https://en.wikipedia.org/wiki/Intel_C%2B%2B_Compiler)

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# C 的標準

### ANSI C / ISO C / Standard C

|  標準 |          GCC |       Clang |      Visual C++ | Intel C++ compiler |                               備註 |
| ---:| ------------:| -----------:| ---------------:| ------------------:| --------------------------------:|
| C89 |          all |         all |             all |                all | 這個版本的語言經常被稱作"ANSI C"，或有時稱為"C89"。 |
| C90 |          all |         all |             all |                all |                                - |
| C99 | GCC 4.6, 4.7 |      mostly | Visual C++ 2015 |             mostly |                                - |
| C11 | GCC 4.6, 4.7 |   Clang 3.1 | Visual C++ 2019 |                  - |                                - |
| C18 |    GCC 8.1.0 | Clang 7.0.0 | Visual C++ 2019 |                  - |                                - |

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# Materials

### Hands on

* [Learn C Programming](https://www.programiz.com/c-programming)
  * [C Tutorial](https://www.tutorialspoint.com/cprogramming/index.htm)

### Wiki

* [C Programming - wikibooks](https://en.wikibooks.org/wiki/C_Programming)

### In details

* [C Programming Language Tutorial](https://www.javatpoint.com/c-programming-language-tutorial)

### Intermediate issues

* [C Programming Language](https://www.geeksforgeeks.org/c-programming-language/)

### Books

* C Programming: A Modern Approach by K. N. King

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# Homework

### BMI calculator in C

#### Input

```c
Please input your height (cm):
187
Please input your weight (kg):
87
```

#### Output

```c
Your BMI is 24.879.
```