which of the following is/are true statements?
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string_index("abcdefgh eieio", "e") -> 10
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string_index("John Smith", ":") -> 0
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string_index(U"abcdefghi", U"def") -> 4
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string_index("qwerty", "")->? 1
To answer this question, we need to understand the concept of string indexing and how it works in different programming languages.
Option A) string_index("abcdefgh eieio", "e") -> 10 - This option is incorrect because the index of the first occurrence of "e" in the given string is 2, not 10.
Option B) string_index("John Smith", ":") -> 0 - This option is correct. In this case, the given string "John Smith" does not contain the character ":". Therefore, the function string_index will return 0, indicating that the character was not found.
Option C) string_index(U"abcdefghi", U"def") -> 4 - This option is correct. The given string "abcdefghi" contains the substring "def" starting at index 3. Therefore, the function string_index will return the index 4.
Option D) string_index("qwerty", "") -> ? 1 - This option is correct. The second argument of the string_index function is an empty string "". In this case, the function will return the index 1, indicating the position before the first character of the given string.
Therefore, the correct answer is B, C, D.