Strings in lua

Faq.txt

Q1) Can't we use the + operator to concatenate two strings?
Ans: No ,In lua to concatenate two strings we should .. operator. eg. st1..st2.

Q2) How can we find the length of a string without using the string length function ?
ans: We can use # symbol in front of the string to find the length of the string.

Q3) Can we access the character of a string using thier indexes?
ans: No we can't and if we try to access it will nil value.

Q4) what is gmatch function in string?
ans: This function give the string which matches a certain pattern from a original string.

maq.txt

Q1. what will be the output of this statement:
        ts="pep"
        st="coder"
        print (ts..#st)
        
 a) pepcoder
 b) error
 c) pep#
 d) pep5
 
 ans. d)
 
 Q2. What will be the output fo the given statement:
          a="hello pepcoder"
          for b in string.gmatch(a, "[^%s]+") do
              print(b)
          end
          
a) hello pepcoder
b) _________
c) hello
   pepcoder
d) none of the above


ans: c)

Q3.What will be the output:

     a="hello pepcode"
     io.write(string.gsub(a,"o","Op")) 
     
a) hellOp pepcOpde
b) hellOp pepcOpde2
c) hellop pepcopde
d) none of the above

ans: b)

Q4. What will correct output for this statement:

      b="12.122344443"
      print(string.format("%.5f",b))

a) 12.122344443
b) error
c) 12.12234
d) none of the above

ans. c)