Question 21 : The________function converts an uppercase letter to the corresponding lowercase letter.
1. islower()
2. isupper()
3. toupper()
4. tolower()
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Question 22 : Which among the given options compares atmost n characters of string ch to string s?
1. int strncmp(ch, s, n)
2. int strcmp(ch, s)
3. int strncmp(s, ch, n)
4. int strcmp(s, ch)
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Question 23 : The______ function returns the number of characters that are present before the terminating null character.
1. strlength()
2. strlen()
3. strlent()
4. strchr()
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Question 24 : Which code from the given option return pointer to last occurrence of c in ch or NULL if not present?
1. char *strchr(ch, c)
2. char *strrchr(ch,
3. c) char *strncat(ch, c)
4. char *strcat(ch, c)
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Question 25 : Is there any function declared as strstr()?
1. true
2. false
3.
4.
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Question 26 : Which header declares several functions useful for testing and mapping characters?
1. assert.h
2. stdio.h
3. ctype.h
4. errno.h
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Question 27 : The strpbrk() function is used to return a pointer to the character, or a null pointer if no character from s2 occurs in s1.
1. true
2. false
3.
4.
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Question 28 : What is the use of function char *strchr(ch, c)?
1. return pointer to first occurrence of ch in c or NULL if not present
2. return pointer to first occurrence of c in ch or NULL if not present
3. return pointer to first occurrence of ch in c or ignores if not present
4. return pointer to first occurrence of cin ch or ignores if not present
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Question 29 : What is the function of void *memset(s, c, n)?
1. places character s into first n characters of c, return c
2. places character c into first n characters of s, return s
3. places character s into first n characters of c, return s
4. places character c into first n character of s, return c
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Question 30 : This function offers the quickest way to determine whether two character sequences of the same known length match character for the character up to and including any null character in both.
1. strcmp()
2. memcmp()
3. strncmp()
4. no such function
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