Discussion
What is the use of function char *strchr(ch, c)?
Answer: B
Correct answer: return pointer to first occurrence of c in ch or NULL if not present
strchr(ch, c) searches the string ch for the character c and returns a pointer to the first occurrence, or NULL if there is none. Returning a pointer rather than an index is what lets the result be used directly as the start of a substring. The terminating null counts as part of the string, so searching for '\0' finds the end.
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