# ERC20

## Functions

### constructor

`constructor(string name_, string symbol_) public` public

\*Developer note: Sets the values for {name} and {symbol}, initializes {decimals} with a default value of 18.

To select a different value for {decimals}, use {\_setupDecimals}.

All three of these values are immutable: they can only be set once during construction.\*

| Name     | Type   | Description |
| -------- | ------ | ----------- |
| name\_   | string |             |
| symbol\_ | string |             |

### name

`function name() public view virtual returns (string)` view public

*Developer note: Returns the name of the token.*

**Returns:**

| Name | Type   | Description |
| ---- | ------ | ----------- |
| \[0] | string |             |

### symbol

`function symbol() public view virtual returns (string)` view public

*Developer note: Returns the symbol of the token, usually a shorter version of the name.*

**Returns:**

| Name | Type   | Description |
| ---- | ------ | ----------- |
| \[0] | string |             |

### decimals

`function decimals() public view virtual returns (uint8)` view public

\*Developer note: Returns the number of decimals used to get its user representation. For example, if \`decimals\` equals \`2\`, a balance of \`505\` tokens should be displayed to a user as \`5,05\` (\`505 / 10 \*\* 2\`).

Tokens usually opt for a value of 18, imitating the relationship between Ether and Wei. This is the value {ERC20} uses, unless {\_setupDecimals} is called.

NOTE: This information is only used for *display* purposes: it in no way affects any of the arithmetic of the contract, including {IERC20-balanceOf} and {IERC20-transfer}.\*

**Returns:**

| Name | Type  | Description |
| ---- | ----- | ----------- |
| \[0] | uint8 |             |

### totalSupply

`function totalSupply() public view virtual returns (uint256)` view public

*Developer note: See {IERC20-totalSupply}.*

**Returns:**

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \[0] | uint256 |             |

### balanceOf

`function balanceOf(address account) public view virtual returns (uint256)` view public

*Developer note: See {IERC20-balanceOf}.*

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| account | address |             |

**Returns:**

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \[0] | uint256 |             |

### transfer

`function transfer(address recipient, uint256 amount) public virtual returns (bool)` public

\*Developer note: See {IERC20-transfer}.

Requirements:

* \`recipient\` cannot be the zero address.
* the caller must have a balance of at least \`amount\`.\*

| Name      | Type    | Description |
| --------- | ------- | ----------- |
| recipient | address |             |
| amount    | uint256 |             |

**Returns:**

| Name | Type | Description |
| ---- | ---- | ----------- |
| \[0] | bool |             |

### allowance

`function allowance(address owner, address spender) public view virtual returns (uint256)` view public

*Developer note: See {IERC20-allowance}.*

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| owner   | address |             |
| spender | address |             |

**Returns:**

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \[0] | uint256 |             |

### approve

`function approve(address spender, uint256 amount) public virtual returns (bool)` public

\*Developer note: See {IERC20-approve}.

Requirements:

* \`spender\` cannot be the zero address.\*

| Name    | Type    | Description |
| ------- | ------- | ----------- |
| spender | address |             |
| amount  | uint256 |             |

**Returns:**

| Name | Type | Description |
| ---- | ---- | ----------- |
| \[0] | bool |             |

### transferFrom

`function transferFrom(address sender, address recipient, uint256 amount) public virtual returns (bool)` public

\*Developer note: See {IERC20-transferFrom}.

Emits an {Approval} event indicating the updated allowance. This is not required by the EIP. See the note at the beginning of {ERC20}.

Requirements:

* \`sender\` and \`recipient\` cannot be the zero address.
* \`sender\` must have a balance of at least \`amount\`.
* the caller must have allowance for \`\`sender\`\`'s tokens of at least \`amount\`.\*

| Name      | Type    | Description |
| --------- | ------- | ----------- |
| sender    | address |             |
| recipient | address |             |
| amount    | uint256 |             |

**Returns:**

| Name | Type | Description |
| ---- | ---- | ----------- |
| \[0] | bool |             |

### increaseAllowance

`function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool)` public

\*Developer note: Atomically increases the allowance granted to \`spender\` by the caller.

This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}.

Emits an {Approval} event indicating the updated allowance.

Requirements:

* \`spender\` cannot be the zero address.\*

| Name       | Type    | Description |
| ---------- | ------- | ----------- |
| spender    | address |             |
| addedValue | uint256 |             |

**Returns:**

| Name | Type | Description |
| ---- | ---- | ----------- |
| \[0] | bool |             |

### decreaseAllowance

`function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool)` public

\*Developer note: Atomically decreases the allowance granted to \`spender\` by the caller.

This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}.

Emits an {Approval} event indicating the updated allowance.

Requirements:

* \`spender\` cannot be the zero address.
* \`spender\` must have allowance for the caller of at least \`subtractedValue\`.\*

| Name            | Type    | Description |
| --------------- | ------- | ----------- |
| spender         | address |             |
| subtractedValue | uint256 |             |

**Returns:**

| Name | Type | Description |
| ---- | ---- | ----------- |
| \[0] | bool |             |


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