|**`+`**|Use a sign (+ or -) to prefix the output value if it's of a signed type.|Sign appears only for negative signed values (-).|

|**`0`**|If *width* is prefixed by **`0`**, leading zeros are added until the minimum width is reached. If both **`0`** and **`-`** appear, the **`0`** is ignored. If **`0`** is specified for an integer format (**`i`**, **`u`**, **`x`**, **`X`**, **`o`**, **`d`**) and a precision specification is also present—for example, `%04.d`—the **`0`** is ignored. If **`0`** is specified for the **`a`** or **`A`** floating-point format, leading zeros are prepended to the mantissa, after the `0x` or `0X` prefix.|No padding.|

|**blank (' ')**|Use a blank to prefix the output value if it's signed and positive. The blank is ignored if both the blank and + flags appear.|No blank appears.|

||When it's used with the **`e`**, **`E`**, **`f`**, **`F`**, **`a`**, or **`A`** format, the **`#`** flag forces the output value to contain a decimal point.|Decimal point appears only if digits follow it.|

||When it's used with the **`g`** or **`G`** format, the **`#`** flag forces the output value to contain a decimal point and prevents the truncation of trailing zeros.<br /><br /> Ignored when used with **`c`**, **`d`**, **`i`**, **`u`**, or **`s`**.|Decimal point appears only if digits follow it. Trailing zeros are truncated.|