6. 4 points #include #include «string.h» #include int main(int argc, char wargvl

Question

6. 4 points #include #include «string.h» #include int main(int argc, char wargvl) ipv4 buffer[16], *str (0,0,0,0), int value [4] locality-offset, index# 0; ; if (argc- 3) locality offset-atoi(argv [2]); else f printf( return 0; IP-addr locauty-offset ", argv[0] ); "usage: %s strcpy(ipv4_ buffer,argv[1]); str ipv4_buffer: while (*str) if (isdigit(*str)) value [index] 10; value [index] += *str- '0'; else f index++ str++; ?e2; %d ",i, value [1] for (int i=0; i++) printf("%d : + locality-offset); return 0; $./prob6 127.0.0.1 5

Explanation / Answer

Q6) Program:

#include <stdio.h>

#include <ctype.h>

#include <string.h>

#include <stdlib.h>

int main(int argc, char *argv[])

{

char ipv4_buffer[16], *str;

int value[4] ={0,0,0,0}, locality_offset, index = 0;

if (argc==3) // argc has been declared but not initialized, thus argc ! = 3

locality_offset=atoi(argv[2]);

else{ // else part executes and the program ends as return 0; is done here

printf("usage: %s IP_addr locality_offset", argv[0]); // Thus statement prints before the program exits

return 0;

}

strcpy(ipv4_buffer, argv[1]); // Program doesn't go at all, this part onwards

str=ipv4_buffer;

  

while(*str){

if(isdigit(*str)){

value[index] *= 10;

value[index] += *str - '0';

}

else{

index++;

}

str++;

}

for(int i=0;i<2;i++)

printf("%d: %d ",i,value[i] + locality_offset);

  

return 0;

}

Output:

Program executed without errors giving output:

usage: main IP_addr locality_offset

Explanation inline to the program above.

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