Computer Science · May / June 2024 · Paper 1 TZ1 HL · Question 16

16. String manipulation is a useful programming concept. Strings are zero-indexed: the index of a string’s first character is 0, and the index of a string’s last character is the length of the string minus 1. A set of string manipulation sub-programs is given in Figure 4. Figure 4: String manipulation sub-programs Name Description Example subString(X, Y, Z) Returns a new string that is a substring of X. The length of the substring is Z and the substring begins with the character at index Y. subString("Test", 2, 1) returns "s" lenString(X) Returns the length of the string X. lenString("Test") returns 4 revString(R) Returns a copy of the string R in reverse order. revString("Test") returns "tseT" joinString(S, J) Returns a new string by concatenating the strings S and J. joinString("Join", "Test") returns "JoinTest"

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