Class 21: Command Line Arguments

Question 1

%myProg p1 p2 p3

Answer 1

Command line arguments

Question 2

Any arguments from the command line will be placed in _____ memory

Answer 2

Read only

Question 3

Int mina(int Argc, char **aargv)
Int main(int argc, char *argv[])

Answer 3

Two appropriate declarations if we want to pass command line arguments

Question 4

What is argc

Answer 4

Contains the count of command line arguments

Question 5

What is argv

Answer 5

Contains pointers to the individual arguments as character strings argv[] is an array of char*

Question 6

% myProg 16 new old

Answer 6

Argv[0] points to “myProg\0”
Argv[1] points to “16\0’
Argv[2] points to “new\0”
Argv[3] points to “old\0”
Argv[4] is a NULL pointer

Question 7

Because these things are of type char*, they are stored in ______ memory and an attempt to write to them will result in a segmentation fault

Answer 7

Read only memory

Question 8

It is guaranteed that argc is non-negative and that argv[argc] is a ________

Answer 8

NULL POINTER

Question 9

THe main() function is special. Every C program must define it exactly ____

Answer 9

ONCE

Question 10

Int atoi()

Answer 10

Converts an ASCII string to an int (4 byte integer data type)

Question 12

Double atof()

Answer 12

Converts ASCII string to 8 byte floating point data type

Question 13

Float f = (float)atof()

Answer 13

If you want a 4-byte floating point data type