Quiz for Standard string functions strlen

Course: C Language | Subject: Unit 5 | Topic: Arrays and Strings

Q1: What does the strlen() function in C return?

A. Number of characters excluding the null character B. Number of characters including the null character C. Number of bytes used by the string variable D. Length of the string in bits

Q2: Which header file is required for strlen()?

A. stdio.h B. string.h C. stdlib.h D. memory.h

Q3: If str = "Hello", what will strlen(str) return?

A. 4 B. 5 C. 6 D. Undefined

Q4: Which of the following is TRUE about strlen()?

A. It modifies the original string B. It returns an int C. It returns a size_t value D. It ignores null characters in the middle

Q5: If str = "A\0BC", what will strlen(str) return?

A. 1 B. 3 C. 4 D. Error

Q6: What will strlen("") return?

A. 0 B. 1 C. Undefined D. Error

Q7: If char s[10] = "C Prog"; strlen(s) returns?

A. 5 B. 6 C. 7 D. Undefined

Q8: strlen() time complexity is?

A. O(1) B. O(n) C. O(n^2) D. O(log n)

Q9: Which of these is correct for strlen("abc")?

A. Returns 2 B. Returns 3 C. Returns 4 D. Error

Q10: strlen("abc\0xyz") returns?

A. 3 B. 7 C. 6 D. Error

Q11: Which return type does strlen() have?

A. int B. size_t C. unsigned int D. long

Q12: strlen(" ") returns?

A. 0 B. 1 C. 2 D. Error

Q13: What does strlen("\0") return?

A. 0 B. 1 C. 2 D. Undefined

Q14: If s = "Hello World", strlen(s) returns?

A. 10 B. 11 C. 12 D. 13

Q15: strlen("Hi\n") returns?

A. 2 B. 3 C. 4 D. Error

Q16: strlen("12345") returns?

A. 4 B. 5 C. 6 D. Error

Q17: strlen() is implemented as?

A. Array indexing loop B. Pointer traversal C. Both A and B possible D. Recursive function

Q18: If char s[] = {'H','i','\0','B','y','e'}; strlen(s) returns?

A. 2 B. 3 C. 5 D. 6

Q19: strlen("Test\0ing") returns?

A. 4 B. 7 C. 8 D. Error

Q20: strlen("ABCDE") == 5?

A. Yes B. No C. Depends D. Error

Are you ready to start test? Set your time limit