linux 中怎么判斷輸入的數字是否為合理的浮點數,相信很多沒有經驗的人對此束手無策,為此本文總結了問題出現的原因和解決方法,通過這篇文章希望你能解決這個問題。
實現代碼如下:
#!/bin/sh # validfloat -- Tests whether a number is a valid floating-point value. # Note that this script cannot accept scientific (1.304e5) notation. # To test whether an entered value is a valid floating-point number, we # need to split the value at the decimal point. We then test the first part # to see if it's a valid integer, then test the second part to see if it's a # valid >=0 integer, so -30.5 is valid, but -30.-8 isn't. . validint # Bourne shell notation to source the validint function validfloat() { fvalue="$1" if [ ! -z $(echo $fvalue | sed 's/[^.]//g') ] ; then decimalPart="$(echo $fvalue | cut -d. -f1)" fractionalPart="$(echo $fvalue | cut -d. -f2)" if [ ! -z $decimalPart ] ; then if ! validint "$decimalPart" "" "" ; then return 1 fi fi if [ "${fractionalPart%${fractionalPart#?}}" = "-" ] ; then echo "Invalid floating-point number: '-' not allowed \ after decimal point" >&2 return 1 fi if [ "$fractionalPart" != "" ] ; then if ! validint "$fractionalPart" "0" "" ; then return 1 fi fi if [ "$decimalPart" = "-" -o -z "$decimalPart" ] ; then if [ -z $fractionalPart ] ; then echo "Invalid floating-point format." >&2 ; return 1 fi fi else if [ "$fvalue" = "-" ] ; then echo "Invalid floating-point format." >&2 ; return 1 fi if ! validint "$fvalue" "" "" ; then return 1 fi fi return 0 }
notice:
1): if [ ! -z $(echo $fvalue | sed 's/[^.]//g') ] 將輸入,以.分成整數和小數部分。
2):if [ "${fractionalPart%${fractionalPart#?}}" = "-" ] 判斷小數點后面如果接‘-'號,這輸出字符不合法
3)接著的一些if語句就是判斷小數及整數部分合不合法
4)由于 valiint函數沒給出,腳本不能完全執行,valiint函數是判斷字符串是否全為數字.
看完上述內容,你們掌握linux 中怎么判斷輸入的數字是否為合理的浮點數的方法了嗎?如果還想學到更多技能或想了解更多相關內容,歡迎關注億速云行業資訊頻道,感謝各位的閱讀!
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