Free Test Standard string functi... – C Language

Q1: What is the main purpose of strcat() function in C?

A. To copy one string to another B. To compare two strings C. To append one string to another D. To find the length of a string

Q2: Which header file is required to use strcat()?

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

Q3: If destination string is not large enough, strcat() may cause?

A. Buffer overflow B. Segmentation fault C. Infinite loop D. No effect

Q4: What will be the output of strcat("Hi", "Bye") if destination has enough space?

A. HiBye B. ByeHi C. Hi Bye D. Error

Q5: The strcat() function stops appending when?

A. It reaches the null character in source B. It reaches the null character in destination C. It reaches end of memory D. It encounters a space

Q6: Which of the following is true about strcat()?

A. It adds a null character at the end automatically B. It overwrites destination content entirely C. It does not require null-terminated strings D. It can append integers directly

Q7: In strcat(dest, src), dest must be?

A. Large enough to hold dest+src B. Equal size of src C. Smaller than src D. Empty string

Q8: What is the return type of strcat()?

A. void B. char* C. int D. bool

Q9: If dest contains "Hello" and src contains "World", strcat(dest, src) will result in?

A. Hello World B. HelloWorld C. WorldHello D. Error

Q10: Can strcat() append part of a string?

A. Yes, using pointer arithmetic B. No, it always appends full string C. Yes, using strcpy() D. No, it replaces string

Q11: If src is empty string, strcat(dest, src) will?

A. Delete dest B. Return unchanged dest C. Cause error D. Append null twice

Q12: What happens to the null terminator of dest during strcat()?

A. It is overwritten B. It is kept intact C. It is moved to the start D. It is removed

Q13: Which is safer alternative to strcat()?

A. strcat_s() B. strappend() C. stringcat() D. safe_strcat()

Q14: What does strcat() do if dest and src overlap in memory?

A. Works fine B. Causes undefined behavior C. Stops appending D. Copies backwards

Q15: Which library defines strcat() in C?

A. ISO C library B. POSIX library C. GNU extensions D. ANSI graphics

Q16: In strcat(), the source string must be?

A. Null-terminated B. Length-prefixed C. Any binary data D. A single character

Q17: If destination is an uninitialized char array, using strcat() will?

A. Work fine B. Cause undefined behavior C. Append empty string D. Fill with garbage

Q18: What is appended at the end of destination after strcat()?

A. Null character B. Space C. Length of string D. Nothing

Q19: Which of these statements is correct about strcat()?

A. It requires enough memory in dest B. It automatically allocates memory C. It can append integers D. It trims spaces

Q20: If dest = "A", src = "B", after strcat(dest, src) the result is?

A. A B. B C. AB D. BA

Quiz for Standard string functions strcat