# strtoi

##### Convert Strings to Integers

Convert strings to integers according to the given base using the C
function `strtol`

, or choose a suitable base following the C rules.

##### Usage

`strtoi(x, base = 0L)`

##### Arguments

- x
a character vector, or something coercible to this by

`as.character`

.- base
an integer which is between 2 and 36 inclusive, or zero (default).

##### Details

Conversion is based on the C library function `strtol`

.

For the default `base = 0L`

, the base chosen from the string
representation of that element of `x`

, so different elements can
have different bases (see the first example). The standard C rules
for choosing the base are that octal constants (prefix `0`

not
followed by `x`

or `X`

) and hexadecimal constants (prefix
`0x`

or `0X`

) are interpreted as base `8`

and
`16`

; all other strings are interpreted as base `10`

.

For a base greater than `10`

, letters `a`

to `z`

(or
`A`

to `Z`

) are used to represent `10`

to `35`

.

##### Value

An integer vector of the same length as `x`

. Values which cannot
be interpreted as integers or would overflow are returned as
`NA_integer_`

.

##### See Also

For decimal strings `as.integer`

is equally useful.

##### Examples

`library(base)`

```
# NOT RUN {
strtoi(c("0xff", "077", "123"))
strtoi(c("ffff", "FFFF"), 16L)
strtoi(c("177", "377"), 8L)
# }
```

*Documentation reproduced from package base, version 3.5.1, License: Part of R 3.5.1*