Empty string: Difference between revisions
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(→{{header|AWK}}: empty string) |
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If (var != "") |
If (var != "") |
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Msgbox the var is not empty</lang> |
Msgbox the var is not empty</lang> |
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=={{header|AWK}}== |
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<lang awk>#!/usr/bin/awk -f |
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BEGIN { |
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# Demonstrate how to assign an empty string to a variable. |
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a=""; |
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b="XYZ"; |
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print "a = ",a; |
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print "b = ",b; |
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print "length(a)=",length(a); |
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print "length(b)=",length(b); |
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# Demonstrate how to check that a string is empty. |
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print "Is a empty ?",length(a)==0; |
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print "Is a not empty ?",length(a)!=0; |
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# Demonstrate how to check that a string is not empty. |
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print "Is b empty ?",length(b)==0; |
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print "Is b not empty ?",length(b)!=0; |
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} |
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<pre>$ awk -f R/tmp/string.awk |
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a = |
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b = XYZ |
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length(a)= 0 |
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length(b)= 3 |
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Is a empty ? 1 |
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Is a not empty ? 0 |
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Is b empty ? 0 |
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Is b not empty ? 1 |
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</pre> |
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=={{header|Bracmat}}== |
=={{header|Bracmat}}== |