---
###### tags: `C++`
---
# Introduction
## Based C++ Structure

# include <iostream> //輸入輸出lib
usigned namespace std; //沒有這個要加std::(eg. std::cout)
int main()
{


return 0; //正常return 0 (不正常return -1)
}

## I/O
| Input | Output |
|:-----:|:------:|
| cin | cout |
| >> | << |
### output
1. **usage:** `cout<<`
2.

| `\n` | `\t` | `\a` | `\\` | `\'` | `\"` | `\r` |
|:-------:|:---:|:-----:|:-----------:|:---:|:---:|:---:|
| endline | tab | alert | print `\` | print`'` | print`"` | carriage return(回車) |
### input
1. **usage:** `cin>>`
2. sucess: return cin， fail: return 0
## Declare
1. **usage：** `(data type) variable;`
2. data type
## operation
| Add | subraction | Multiplication | Division | Remainder |
|:---:|:----------:|:--------------:|:--------:|:---------:|
| + | - | * | / | % |

### Precedence
1.`()`
2. `*` `/` `%`
3. `+` `-`

## Operator