13 January 2012

Shell Script to find Greatest of Three Number using if-else Statement

20 comments

Q. How do I write Shell Script to find Greatest of Three Numbers by If-else statement


Ans:

#!/bin/bash
echo "enter first number"
read first
echo "enter second number"
read sec
echo "enter third number"
read third
if [ $first -gt $sec ] ; then
if [ $first -gt $third ] ; then
echo -e " $first is greatest number "
else
echo -e " $third is greatest number "
fi
else
if [ $sec -gt $third ] ; then
echo -e " $sec is greatest number "
else
echo -e " $third is greatest number "
fi
fi


Output


shell script to find greatest of three numbers using if else statement

Enjoy :)


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20 comments:

  1. The below code can also serve the purpose

    echo "Enter the three numbers which are to be compared"
    read var1 var2 var3
    if [[ $var1 > $var2 ]] && [[ $var1 > $var3 ]];then
    echo "$var1 is gretest of three numbers"
    elif [[ $var2 > $var1 ]] && [[ $var2 > $var3 ]];then
    echo "$var2 is greatest of three number"
    elif [[ $var3 > $var1 ]] && [[ $var3 > $var2 ]];then
    echo "$var3 is gretaer of three numbers"
    else
    echo " All the three numbers are equal"
    fi

    ReplyDelete
    Replies
    1. This is not the right code for comparing three numbers. If I enter 2, 2, 1 as my three numbers, the o/p is 0.

      Here is the right code.

      # Creating a max function to get the max number
      max() {
      if [[ ( $q1 -eq $q2 ) && ( $q2 -eq $q3 ) ]] ; then
      retval=$q1
      fi
      if [[ ( $q1 -gt $q2 ) && ( $q1 -gt $q3 ) ]] ; then
      retval=$q1
      fi

      if [[ ( $q1 -gt $q2 ) && ( $q1 -lt $q3 ) ]] ; then
      retval=$q3
      fi

      if [[ ( $q2 -gt $q1 ) && ( $q2 -gt $q3 ) ]] ; then
      retval=$q2
      fi

      if [[ ( $q1 -gt $q2 ) && ( $q1 -eq $q3 ) ]] ; then
      retval=$q1
      fi

      if [[ ( $q1 -eq $q2 ) && ( $q1 -lt $q3 ) ]] ; then
      retval=$q3
      fi

      if [[ ( $q1 -lt $q2 ) && ( $q2 -eq $q3 ) ]] ; then
      retval=$q2
      fi

      if [[ ( $q1 -eq $q2 ) && ( $q2 -gt $q3 ) ]] ; then
      retval=$q2
      fi

      return $retval
      }

      Delete
    2. This comment has been removed by the author.

      Delete
  2. How do you print out the three numbers in decending order?

    ReplyDelete
  3. This comment has been removed by the author.

    ReplyDelete
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    ReplyDelete
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    ReplyDelete