Arrays and Strings - C Programming MCQ Questions and Answers

1

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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Answer & Solution

Answer: Option A

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2

The isdigit function tests for any decimal-digit character.

A) true B) false

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Answer & Solution

Answer: Option A

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3

which of the following function returns a pointer to the located string or a null pointer if string is not found.

A) strtok() B) strstr() C) strspn() D) strrchr()

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Answer & Solution

Answer: Option B

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4

void *memcpy(void *dest, const void *src, size_t n) What does the following code do?

A) copies n characters from src to dest B) copies n character from dest to src C) transform n character from dest to src D) transform n character from src to dest

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Answer & Solution

Answer: Option A

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5

What will be the output of the following C code?

errno = 0;
y = sqrt(-10);
if(errno == EDOM)
printf("Invalid value \n");
else
printf("Valid value\n");

A) Invalid value B) Valid value C) No output D) Compile error

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Answer & Solution

Answer: Option A

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6

This function checks whether the passed character is white-space.

A) ispunct() B) isgraph() C) isspace() D) isalpha()

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Answer & Solution

Answer: Option C

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7

What is the function of strcoll()?

A) compares the string, result is dependent on the LC_COLLATE B) copies the string, result is dependent on the LC_COLLATE C) compares the string, result is not dependent on the LC_COLLATE D) copies the string, result is not dependent on the LC_COLLATE

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Answer & Solution

Answer: Option A

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8

isalpha() function is used to detect characters both in uppercase and lowercase.

A) true B) false

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Answer & Solution

Answer: Option A

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9

Which header declares several functions useful for testing and mapping characters?

A) assert.h B) stdio.h C) ctype.h D) errno.h

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Answer & Solution

Answer: Option C

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10

What will be the output of the following C code?

int i = 0;
char c;
char str[ ] = "Little Star";
while(str[i])
{
putchar (toupper(str[i]));
i++;
}

A) little star B) lITTLE sTAR C) LITTLE STAR D) Little Star

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Answer & Solution

Answer: Option C

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