C Questions and Answers – String Operations – 1

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “String Operations – 1”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

1. There are two groups of string functions defined in the header <string.h>. What are they?
a) first group names beginning with str; second group names beginning with mem
b) first group names beginning with str; second group names beginning with is
c) first group names beginning with string; second group names beginning with mem
d) first group names beginning with str; second group names beginning with type
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2. What is the use of function char *strchr(ch, c)?
a) return pointer to first occurrence of ch in c or NULL if not present
b) return pointer to first occurrence of c in ch or NULL if not present
c) return pointer to first occurrence of ch in c or ignores if not present
d) return pointer to first occurrence of cin ch or ignores if not present
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3. Which code from the given option return pointer to last occurrence of c in ch or NULL if not present?
a) char *strchr(ch, c)
b) char *strrchr(ch, c)
c) char *strncat(ch, c)
d) char *strcat(ch, c)
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4. Which among the given options compares atmost n characters of string ch to string s?
a) int strncmp(ch, s, n)
b) int strcmp(ch, s)
c) int strncmp(s, ch, n)
d) int strcmp(s, ch)
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5. Which among the given options is the right explanation for the statement size_t strcspn(c, s)?
a) return length of prefix of s consisting of characters not in c
b) return length of prefix of s consisting of characters present in c
c) return length of prefix of c consisting of characters not in s
d) return length of prefix of c consisting of characters present in s
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6. The mem functions are meant for _______
a) returning a pointer to the token
b) manipulating objects as character arrays
c) returning a pointer for implemented-defined string
d) returning a pointer to first occurrence of string in another string
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7. What is the function of void *memset(s, c, n)?
a) places character s into first n characters of c, return c
b) places character c into first n characters of s, return s
c) places character s into first n characters of c, return s
d) places character c into first n character of s, return c
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8. Functions whose names begin with “strn”
a) manipulates sequences of arbitrary characters
b) manipulates null-terminated sequences of characters
c) manipulates sequence of non – null characters.
d) returns a pointer to the token
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9. Which of the following is the right syntax to copy n characters from the object pointed to by s2 into the object pointed to by s1?
a) void *memcpy(void *s1,const void *s2,size_t n);
b) void *memcpy(void *s2, const void *s1, size_t n);
c) void memcpy(void *s1,const void *s2, size_t n);
d) void memcpy(void *s2,const void *s1,size_t n);
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10. What does the following function returns void *memmove(void *s1,const void s2, size_t n);?
a) returns the value of s1
b) returns the value of s2
c) doesn’t return any value
d) returns the value of s1 and s2
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