Four Arithmetic Operation

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Tp1: calculation of a formula with only a kind of operator

#! /bin/shn=$#if [ $n -eq 0 ]then    echo "Opération manquante"    exitelif [ $n -eq 1 ]then    echo "Opréation manquante"else    res=$2    case $1 in    "add")        echo -n  $2        shift 2            while [ $# -ne 0 ]        do        echo -n "+$1"        res=`expr $res + $1`        shift        done        echo  "=${res}";;    "supp")        echo -n  $2        shift 2            while [ $# -ne 0 ]        do        echo -n "-$1"        res=`expr $res - $1`        shift        done        echo  "=${res}";;    "mult")        echo -n  $2        shift 2            while [ $# -ne 0 ]        do        echo -n "x$1"        res=`expr $res \* $1`        shift        done        echo  "=${res}";;    "div")        echo -n  $2        shift 2            while [ $# -ne 0 ]        do        echo -n "/$1"        if [ $1 -eq 0 ]        then            echo -e "\nDivision par 0 interdite"            exit        else                        res=`expr $res / $1`            shift        fi        done        echo  "=${res}";;    *)        echo "Opération non traitée";;    esac fi

Tp2: calculation of a formula without considering the priority of each operator

#! /bin/shif [ $# -eq 0 ]then    echo " Opérande manquante"    exitelse    res=$1    echo -n "$1"    shift    while [ $# -ne 0 ]    do    case $1 in        "+")        echo -n " $1 $2"         res=`expr $res + $2`        shift 2        ;;        "-")        echo -n " $1 $2"         res=`expr $res - $2`        shift 2        ;;        "x")        echo -n " $1 $2"         res=`expr $res \* $2`        shift 2        ;;        "/")        echo -n " $1 $2"        if [ $2 -eq 0 ]        then            echo  " ->Divivion par 0 interdite"            exit        else            res=`expr $res / $2`            shift 2        fi        ;;        *)        echo  " $1 -> Opération non traitée"        exit    esac    done    echo " = $res"fi

Tp3: calculation of a formula without brackets

#! /bin/shindex=0while [ $# -gt 0 ]do    if [ $1 != x -a $1 != / ]    then    low_priority[$index]=$1    index=`expr $index + 1`    shift 1    else    case $1 in        "x")        pre_index=`expr $index - 1`        res=`expr ${low_priority[$pre_index]} \* $2`        low_priority[$pre_index]=$res            shift 2            ;;        "/")        pre_index=`expr $index - 1`        res=`expr ${low_priority[$pre_index]} / $2`        low_priority[$pre_index]=$res        shift 2        ;;    esac   fidonen=1length=${#low_priority[@]}end=`expr $length - 2`res=${low_priority[0]}while [ $n -le $end ]do     case ${low_priority[$n]} in    "+")        nex_n=`expr $n + 1`        res=`expr $res + ${low_priority[$nex_n]}`        n=`expr $n + 2`;;    "-")        nex_n=`expr $n + 1`        res=`expr $res - ${low_priority[$nex_n]}`        n=`expr $n + 2`;;    *)        exit;;     esacdoneecho $res

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