Question

C programming Question1 (a) Write a C program that will print out all command line arguments, in reverse order, one per line. Prefix each line with its index. 6 marks] (b) Consider this C code snippet int a- 100 int b- 42; inte p- &a; int q-b; p qi printf ("%d %d\n" ,a,*p); When this code is executed, what numbers will it print? [2 marks] (c) Consider this C program int main(int argc,char argv) char* target- "Apple" char vord[100] printf ("Enter a ord: "; scanf ("%s" ,&line) ; İf( word.-target )( else printf("sameln") printf("differentIn) return 0; This program does not work as expected. Explain why, and suggest how it can be fixed. [3 marks] (d) During your pracwork you have used the C string-duplicate function, whose sig nature S: char* strdup (char* source) Write an implementation of strdup. 3 marks] (e) The questions in this part are about the C pre-processor. i. What is the output of this program? #include <stdio.h> #define SQR(x) (x#x) int main(int argc, char argv) int number- 10; printf (%din, SQR (number +6)) ; return 0 [2 marks] ii. Conditional compilation controls which parts of a source file will be com piled. In the following program code, is the file program.h included twice in program.c? Explain why, or why not.

Answer 1

PROGRAM-1:

SOURCE CODE:

*Please follow the comments to better understand the code.

**Please look at the Screenshot below and use this code to copy-paste.

***The code in the below screenshot is neatly indented for better understanding.

======================================================

#include<stdio.h>
  
int main(int argc,char* argv[])
{
int counter;
for(counter=argc-1;counter>0;counter--)
printf("\n[%d]: %s",argc-counter,argv[counter]);
return 0;
}

===================================================

OUTPUT:

==============

main.C 1 #include<stdio.h> 2 3 int main(int argc,char argv[l) 5 int counter 6 for (counter-argc-1;counter>e;counter-) ("in[M]: counter, argv[counter]); printf %s",argc 8 9 return ; Command line arguments one two three four [1 four [2]: three [31: two [41: one .Program finished with exit code 0 Press ENTER to exit console.

(b) The answer is 52 42

#include<stdio.h> 1 3 int main(int argc, char* argv) 5 int a-100; 6 int b-42; 7 int* p-&a; 8 3 int q-&b; pq+10; P-95 printf("%d %d\n" , a , *p); 10 11 12 13 14 return e; Output: 52 42

=========================

(C) Here in line scanf("%s",&line) , we should not use & operator for string.

Simply use scanf("%s",line)

===============================

(d)PLEASE USE THE CODE:

char strdup (char source) int i-0; char *dest; while(source[i]!-NULL) dest+-source[il; return dest;

==============

(e)i The output is: 76

• number=10
• SQR(number+6)
  • number+6 * number+6
  • 10+6*10+6 ==> (Here * has more precedence)
  • 10+60+6
  • 76

=====================

(e) ii Yes, twice it will be included.

because the preprocessor will simply replace the program.h with the file.

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