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Update README.md

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Pranav Srinivas Kumar 2019-09-10 10:15:15 -05:00 committed by GitHub
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@ -124,9 +124,9 @@ Here's what's happening:
There are scenarios where you would like to make an optional argument ***required***. As discussed above, optional arguments either begin with `-` or `--`. You can make these types of arguments required like so:
```cpp
program.add_argument("-o", "--output")
.required()
.help("specify the output file.");
program.add_argument("-o", "--output")
.required()
.help("specify the output file.");
```
If the user does not provide a value for this parameter, an exception is thrown.
@ -134,10 +134,10 @@ If the user does not provide a value for this parameter, an exception is thrown.
Alternatively, you could provide a default value like so:
```cpp
program.add_argument("-o", "--output")
.default_value(std::string("-"))
.required()
.help("specify the output file.");
program.add_argument("-o", "--output")
.default_value(std::string("-"))
.required()
.help("specify the output file.");
```
### Negative Numbers