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Arrays and Strings Operations Programming Logic

Learn core concepts, essential formulas, and attempt practice questions designed on the latest TCS NQT testing patterns.

Key Concepts & Formulas

  • 1Array index starts at 0, name of array is a pointer to the first element.
  • 2Strings in C are null-terminated character arrays.

TCS NQT Style Practice Questions

Practice Question 1

What is output: int arr[3]={1,2,3}; printf("%d", *(arr+1));

A) 2
B) 1
C) 3
D) Address of arr

Correct Answer: A) 2

Step-by-step Solution: *(arr+1) is equivalent to arr[1]. arr[1] is 2.

Practice Question 2

How is string 'OK' stored in memory array?

A) ['O', 'K', '\0']
B) ['O', 'K']
C) ['\0', 'O', 'K']
D) ['O', '\0', 'K']

Correct Answer: A) ['O', 'K', '\0']

Step-by-step Solution: All C strings are appended with a terminating null character ('\0') to mark the end of string.

Study Pro-Tip

Array address index formula: *(arr + i) = arr[i] holds universally in C.

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