Quiz for Command-line arguments

Q1: How are command-line arguments passed to a C program?

A. Through main() parameters argc and argv B. Using global variables C. Using scanf() D. Using getenv()

Q2: What does argc represent in command-line arguments?

A. Number of arguments passed including program name B. Pointer to arguments array C. Value of the first argument D. Number of environment variables

Q3: What type is argv in main function?

A. Array of pointers to char B. Pointer to int C. Pointer to float D. Array of integers

Q4: What is argv[0] typically?

A. Program name or path B. First argument C. Environment variable D. Null pointer

Q5: How do you access the third command-line argument?

A. argv[3] B. argv[2] C. argv[1] D. argv[0]

Q6: What will be the value of argc if no arguments are passed?

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

Q7: Can command-line arguments contain spaces?

A. Yes, if enclosed in quotes B. No C. Only in Windows D. Only in Linux

Q8: What happens if you access argv beyond argc?

A. Undefined behavior or crash B. Returns NULL safely C. Returns empty string D. Returns program name

Q9: Which header is required for command-line argument functions?

A. No special header needed B. #include <stdlib.h> C. #include <stdio.h> D. #include <string.h>

Q10: What does argv[argc] contain?

A. NULL pointer B. Last argument C. Program name D. First argument

Q11: Can command-line arguments be used to control program behavior?

A. Yes B. No C. Sometimes D. Only with environment variables

Q12: Is it necessary to check argc before accessing argv?

A. Yes, to avoid out-of-bounds access B. No C. Only in some compilers D. Only in embedded systems

Q13: How do you convert a command-line argument to an integer?

A. Using atoi() B. Using scanf() C. Using strcpy() D. Using strlen()

Q14: What is the return type of main with command-line arguments?

A. int B. void C. char D. float

Q15: Can command-line arguments be used for security?

A. Potentially risky if unchecked B. Always safe C. Never used D. Only in GUI programs

Q16: Are command-line arguments portable across operating systems?

A. Generally yes, but syntax differs B. No, only on Windows C. No, only on Linux D. Only in embedded devices

Q17: Which of the following is NOT a valid way to declare main to accept command-line arguments?

A. int main(int argc, char *argv[]) B. int main(int argc, char **argv) C. void main(int argc, char *argv[]) D. int main()

Q18: What does the following declaration mean: char **argv?

A. Pointer to pointer to char (array of strings) B. Pointer to char C. Pointer to int D. Pointer to float

Q19: What is the typical use of argc and argv in C programs?

A. To process inputs provided when program is run B. To store environment variables C. To control memory allocation D. To handle files

Q20: Can argv be modified inside the program?

A. Yes, it can be modified B. No, it is read-only C. Only in certain compilers D. Only if declared const