# Tra cứu code Python, C++ và Pascal
## Cấu trúc chương trình
### Python

print("Hello world");

#### Data types and variable
#### Arithmetic operations
#### Data input/output
#### Data type conversion
#### Conditional elements
#### Loops
#### Strings
1. ###### Input / output

print("Hello world.")

3. ###### Concatenate, insert, remove
4. ###### Loop through string’s chars
5. ###### Find and replace
6. ###### Split and join
7. ###### Uppercase, lower, title, trim, snip

#### List / Array / Vector
1. ###### The basics
1. ###### Manipulation

#### Multi-dimensional array
#### Functions / Procedures
1. ###### Declaration
1. ###### Implementation
1. ###### Passing values & passing references
#### Map / dictionary
1. * ###### Declaration
1. * ###### Initialization
1. * ###### Loop through elements
1. * ###### Manipulation: add, remove, check a key for existence, find

#### Set

### C++

#include iostream;
using namespace std;

int main {
    int n = 5;
    double x = -2.5;
    string s = "ucode.vn";
    cout << n << endl << x << endl << s << endl;
}

### Pascal

T = int(input())
writeln(T);