C Arrays Questions and Answers
C Arrays questions with answers are among the most frequently asked topics in C programming questions and answers for technical interviews. Arrays form the backbone of data storage and manipulation in C language. By mastering array declaration, initialization, and traversal, you build a strong base for coding efficiency. Companies like TCS, Wipro, and Cognizant often test candidates with C array MCQs to assess logical implementation and memory handling. This section includes solved examples, explanations, and C array programs to help students achieve accuracy and confidence in placement tests.
C Arrays
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50 questions
31. The value within the [ ] in an array variable specifies
- subscript value
- size of the array
- value of the array element
- array bount
32. In a multi-dimensional array with initialization
- The rightmost dimension may be omitted
- The leftmost dimension may be omitted.
- Nothing must be omitted.
- All may be omitted.
33. When should an array be used ?
- When we need to hold variable constants.
- When we need to hold data of the same type
- When we need to obtain automatic memory cleanup functionality.
- When we need to hold data of different types.
34. x [2] = 5; 2 [x] = 5; Are x [2] and 2[x] identical in the sample code above ? why or why not ?
- No. Both variable assignments have invalid syntax.
- No. x[2] is correct, but 2[x] is invalid syntax.
- Yes. Both are identical because they are resolved to pointer references.
- No. 2[x] is correct, but x[2] is invalid syntax.
35. main ( ) { int a [100], i; for ( i = 1 ; i <= 100; ++i) { ... ; }
- The above loop statement is incorrect since the last valid subscript of a is 99
- The above loop statement is incorrect i is not initializedto 0.
- The above loop statement is correct.
- The above loop statement is incorrect since i is pre-incremented.
36. Char sub [ 10] = ???? ; which of the following statements cannot be used to replace the ???? in the above syntax to initialize sub with string "Maths"?
- { "Maths"}
- {'M', 'a' , 't', 'h', 's', '\0'}
- {'M' "aths"}
- {"Mat" "hs"}
37. main ( ) { const int size = 5; int i, n, line [size]; for (i = 0; i< n; i++) { line [ i ] = i; } } What will happen when the sample code fragment above is executed ?
- The array will be initialized with the numbers 0 through 39.
- The code will not compile.
- The code will compile with warnings.
- the code will compile, but not link.
38. Which of the following macros would properly return the number of elements in an array (not a pointer, an actual array )?
- # define NUM_ELEM (x) (sizeof (x)/size of (x[0]))
- # define NUM ELEM (x) (size of (X))
- # define NUM ELEM (x) (sizeof (x()/size of (x[0]))
- #include <stdio.h>
39. main ( ) { char sl [ 100]; char s2 [100]; gets (s1); fgets ( s2, sizeof (s2), stdin ); printf ("%d\n", strlen (s1) - strlen (s2)); } What will be printed when the above code is executed and the string "abcd" is entered twice on stdin ?
- -1
- 0
- 1
- 4
40. int booklet [3] [2] [2] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, }; What value does booklet [2][1][0] in the sample code above contain ?
- 5
- 7
- 9
- 11