how to check if argument is a string or int

» generics » how to check if argument is a string or int

By : user3100410

Date : January 12 2021, 07:00 PM

To fix the issue you can do I have wrote a function getResult() that has only one parameter. , You can write something like this:

code :

fun getResult(args: Any?): Int =
    when (args) {
        is Int -> args * 5
        is String -> args.length
        else -> 0
    }

Share :

use conditional in bash script to check string argument

By : Thomas Mantay

Date : March 29 2020, 07:55 AM

To fix this issue I am trying to write my shell script thing.sh so that upon making it an executable and running it with the single letter ``A" like so: , What about the shorter :

code :

#!/bin/bash

[[ $1 == A ]] && echo "A" || echo "not A"

#!/bin/bash

if [[ $1 == A ]]; then
    echo "A"
else
    echo "not A"
fi

How to check if the argument passed is a string in c?

By : Rupesh

Date : March 29 2020, 07:55 AM

will be helpful for those in need
what I want is that if someone passes a string than I give an error

How to check if an argument is a string in unix

By : 陈月阳

Date : March 29 2020, 07:55 AM

seems to work fine If you want to know if a particular argument is a string, the answer is "yes". All arguments are strings. If you want to know if an argument is a particular string, check it:

code :

for arg; do
  if test "$arg" = incr; then
    echo incr is passed as an argument
  fi
done

Check if type can be an argument to boost::lexical_cast<string>

By : AĦmệd Kặŝệm

Date : November 22 2020, 01:01 AM

hop of those help? Your expression is not sufficient, as the lexical_cast function template takes everything and only reports errors via an internal static_assert. Instead test whether inserting the object into an std::ostream is valid:

code :

template <typename T, typename=void>
struct IsLexCastable : std::false_type {};

// Can be extended to consider std::wostream as well for completeness
template <typename T>
struct IsLexCastable<T,
            decltype(void(std::declval<std::ostream&>() << std::declval<T>()))>
  : std::true_type {};

How can I check if the value of argument provided from GETOPTS is equal to specific string?

By : neekro

Date : March 29 2020, 07:55 AM

This might help you So really the only change you need to make is to change your ((...)) statement to a [[ ... ]] statement as @Nahuel Fouilleul suggested and add $'s to your destination variables. Their suggestion didn't work for you however because destination was spelled wrong. I have the updated code shown below.

code :

#!/bin/bash

usage() { echo "Usage: $0 [-m < local|remote>]" 1>&2; exit 1; }

while getopts "m:" o; do
  case "${o}" in
    m)
        destination=${OPTARG}
        [[ $destination == "local" || $destination == "remote" ]] || usage
        ;;
    *)
        usage
        ;;
  esac
done

shift "$(( OPTIND-1 ))"

echo $destination

...
    m)
        destination=${OPTARG}
        ;;
...

[[ ${destination:?A destination is required.} == "local" || ${destination} == "remote" ]] || usage

echo $destination