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C String Test 1


1) Which of the function is more appropriate for reading a multi-word string?

  1. puts()
  2. gets()
  3. printf()
  4. scanf()

The correct option is (b).

Explanation:

The function gets() is used for collecting a string of characters terminated by new line from the standard input stream stdin.

Therefore gets() is more appropriate for reading a multi-word string.

2) Which library function can change an unsigned long integer to a string?

  1. system()
  2. ltoa()
  3. ultoa()
  4. unsigned long can't be change into a string

The correct option is (c).

Explanation:

The function ultoa() is used for converting an unsigned long integer to a string.

3) What is the value return by strcmp() function when two strings are the same?

  1. 2
  2. 1
  3. 0
  4. Error

The correct option is (c).

Explanation:

C library function strcmp() compares the two strings with each other and the value is return accordingly.

Comparison occurs between a first string (str1) with a second string (str2).

On comparing the two string, the values return by a function strcmp() are:

  • If, str1 is equal to str2 then Return value = 0
  • If, str1 is greater than str2 then Return value > 0
  • If, str1 is less than str2 then Return value < 0

4) What is built in library function for comparing the two strings?

  1. strcmp()
  2. equals()
  3. str_compare()
  4. string_cmp()

The correct option is (a).

Explanation:

The strcmp() is a built-in function available in "string.h" header file. It is used for comparing the two strings. It returns 0 if both are same strings. It returns positive value greater than 0 if first string is greater than second string, otherwise it returns negative value.

5) What will be the output of the below program?

  1. b
  2. a
  3. A
  4. 65

The correct option is (c).

Explanation:

Step 1: char a[] = "%d\n"; The variable 'a' is declared as an array of characters and initialized with string "%d".

Step 2: a[1] = 'b'; Here, we overwrite the second element of array ?a? by 'b'. Hence the array ?a? becomes "%c".

Step 3: printf(a, 65); becomes printf("%c", 65);

Therefore it will print the ASCII value of 65. Hence the output is 'A'.





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