implement a simplistic version of Linux tr (translate) command. Your program:
computer science
Description
Question 1
In F1.c implement a simplistic version
of Linux tr (translate)
command. Your program:
-expects 2 command-line arguments (CLAs), set1
and set2
-reads characters from stdin, and writes them
to stdout,
replacing characters from set1 by those of set2 (like tr).
-Note:
-sets are alphanumeric characters of same length e.g.:
./a.out abc x3Q
-if not 2 CLAs, or if set1 and set2 not same length, or set1
not alphanumeric, or set2 not alphanumeric, print
"BAD INPUT" on stdout and exit. (Note: stdout, not stderr!)
-do NOT implement tr's options or
"interpreted sequences", as
defined in the tr man page (e.g., -d, -s, '\n', [:alnum:])
-Example:
>cat infile
m fnd
vibux
>gcc F1.c
>./a.out mfvb CaLn <infile
C and
Linux
>
-TEST YOUR PROGRAM. Its output should match
tr's. E.g.,
>tr mfvb CaLn <infile
C and
Linux
>
Question 2
Consider the following memory
representation, similar to
the course notes:
100 101 102
103 ... 200
... 308 ... 400
--------------------------------------------------
...|'a' |'c' |'e' |'\0'| ... |100
|...|102 |...|200 |...
--------------------------------------------------
X Y
Z
Copy the program below into file F2.c
and replace all four
AAAA so that the program corresponds to
the above memory
representation.
Note:
-Each AAAA is replaced with a different code fragment.
-Your actual addresses will differ, but equal addresses
above should still be equal in your program, i.e.,
-the value of X should be the same as the address where
'a' is located in memory.
-the value of Y should be the same as the address where
'e' is located in memory.
-the value of Z should be the same as the address of X
-the last two AAAA must be replaced with code which uses
variable Z to obtain the value of X[1].
This results in zero on this question:
Any modifications to the given code
other than replacing
AAAA.
e.g., do not add/remove spaces.
When your program runs, it must print:
X=ace
Y=e
X[1]=c
#include <stdio.h>
int main (void) {
char *X = "AAAA"; //2
marks
char *Y = AAAA; //2 marks
char **Z = &X;
printf("X=%s\n",X);
printf("Y=%s\n",Y);
//next printf MUST use Z to print value of X[1]
printf("X[1]=%c\n",AAAA Z AAAA)); //4 marks
}
