a. CLS LET A\$ = "COMPUTERS" FOR $$ X=1 $$ TO LEN (A\$) READ Z $$ \operatorname{LET} B \$=B \$+\operatorname{MID} \$(A \$, Z, 1) $$ NEXT PRINT B\$ $$ \begin{array}{l} \text { DATA } 3,2,5,9,7,4,6,8 \ \text { END } \end{array} $$ Questions: 1. Write the name of string operator in the above program. ii. List different string variables used in the above program.

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Let's analyze the provided program step by step to answer the questions.

### Program Analysis

1. **String Operator**: 
   - The string operator used in the program is `MID`. This operator is used to extract a substring from a string. In this case, it extracts one character from the string `A$` at the position specified by `Z`.

2. **String Variables**:
   - The different string variables used in the program are:
     - `A$`: This variable holds the string "COMPUTERS".
     - `B$`: This variable is initialized to an empty string and is used to build a new string by concatenating characters from `A$`.
     - `Z`: Although `Z` is not a string variable, it is used as an index to read positions from the `DATA` statement and extract characters from `A$`.

### Summary of Answers

1. **String Operator**: `MID`
2. **String Variables**: `A$`, `B$`
1. **String Operator**: `MID` 2. **String Variables**: `A$`, `B$`

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