What is the mean of line res.substring (0,vidx)+""3.14''+res.substring(vidx+2

#1

what is the mean of line res.substring (0,vidx)+""3.14’’+res.substring(vidx+2

#2

take substring from 0 to vidx position

a

add 3.14 to the string

take the substring from vidx position+2 uptil the string end

http://www.cplusplus.com/reference/string/string/substr/

#3

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