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Changing the values of a column using awk and gsub

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# 1  
Changing the values of a column using awk and gsub


I am using the following code to change NA to X in only the 5th column of my text file:

awk '{gsub("NA","x",$5)}1' in.file > out.file

How can I modify this code if I want to change NA to X in multiple columns of the text file (i.e. columns 5,6 and 7). Thanks!
# 2  
awk -v c='5 6 7' 'BEGIN {n=split(c,a)}{for(i=1;i<=n;i++)gsub("NA","x",$a[i])}1' in.file > out.file

# 3  
awk ' { for(i=5;i<=7;i++) gsub("NA","x",$i); }1' in.file > out.file


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