Free Test Standard string functi... – C Language

Q1: What is the primary purpose of the strcpy() function in C?

A. To copy one string into another B. To compare two strings C. To concatenate two strings D. To reverse a string

Q2: Which header file must be included to use strcpy()?

A. <stdio.h> B. <string.h> C. <stdlib.h> D. <ctype.h>

Q3: What happens if the destination array in strcpy() is smaller than the source string?

A. It works fine B. It causes buffer overflow C. It truncates the string D. It gives a compile error

Q4: Which of the following is the correct syntax of strcpy()?

A. strcpy(src, dest) B. strcpy(dest, src) C. strcpy(src) D. strcpy(dest)

Q5: What does strcpy() return?

A. void B. The length of the copied string C. Pointer to destination D. Pointer to source

Q6: If src = "Hello" and dest is empty, after strcpy(dest, src) what will dest contain?

A. "Hello" B. "Hello\0" C. "Hello " (with space) D. Unchanged

Q7: Can strcpy() copy partial strings?

A. Yes, using an index B. Yes, using strncpy() C. No D. Yes, using loops

Q8: strcpy(dest, "ABC"); strcpy(dest, "XYZ"); What will dest contain?

A. "ABCXYZ" B. "XYZ" C. "ABC" D. Compilation error

Q9: What is a safe alternative to strcpy() to avoid buffer overflow?

A. strncpy() B. sprintf() C. gets() D. puts()

Q10: What will be the result of strcpy(dest, dest)?

A. It works normally B. It results in undefined behavior C. It reverses the string D. It clears the string

Q11: What does strcpy() do with the null terminator from the source?

A. Ignores it B. Copies it to destination C. Removes it D. Adds a space instead

Q12: Which is correct: strcpy(str1, str2) assumes that str1 is?

A. Smaller than str2 B. Larger or equal in size to str2 C. A pointer to int D. Constant

Q13: If src = "AB" and dest has size 2, what happens after strcpy(dest, src)?

A. Copies fine B. Buffer overflow C. Compile error D. Truncates string

Q14: strcpy(s1, ""); What will s1 contain?

A. Null string B. Garbage C. Space D. Compilation error

Q15: What is the complexity of strcpy()?

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

Q16: Is strcpy() case sensitive?

A. Yes B. No C. Depends on compiler D. Depends on OS

Q17: What happens to the destination string if source is shorter than previous content?

A. Old data remains after null terminator B. Old data is cleared C. Memory error D. Padding occurs

Q18: Which function is better to use for secure copying in C11 standard?

A. strcpy_s() B. memcpy() C. printf() D. putchar()

Q19: Which of these is NOT a valid use of strcpy()?

A. Copying constant string to char array B. Copying one array to another C. Copying to string literal D. Copying to dynamically allocated array

Q20: If you want to copy only first 5 characters of a string, which should you use?

A. strncpy() B. strcpy() C. memset() D. strcmp()

Quiz for Standard string functions strcpy