Discussion
What will be the output of the following C code?
char str1[] = "Helloworld ";
char str2[] = "Hello";
len = strspn(str1, str2);
printf("Length of initial segment matching %d\n", len );
Answer: B
Correct answer: 5
strspn returns the length of the initial run of str1 made up only of characters from str2. The set is {H, e, l, o}, and Hello uses nothing else - but the sixth character, w, is not in the set, so the run stops there. The answer is 5.
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