Device Drivers Question:

Tell me what is the output of this program?

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int main()
{
char *ptr;
memcpy(ptr,"google",11);
printf("%sn",ptr);
return 0;
}
a) google
b) segmentation fault
c) syntax error
d) none of the mentioned

Linux Device Drivers Interview Question
Linux Device Drivers Interview Question

Answer:

b) segmentation fault
Explanation:
Memory must be allocated to pointer "ptr".
Output:
[root@localhost google]# gcc -o san san.c
[root@localhost google]# ./san
Segmentation fault (core dumped)
[root@localhost google]#


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What is the output of this program?

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int main()
{
char *ptr;
ptr = (char*)malloc(sizeof(char)*11);
strcpy(ptr,"google");
printf("%dn",*ptr);
return 0;
}
a) s
b) google
c) 115
d) segmentation fault		What is the output of this program?

#include<stdio.h>
#include<stdlib.h>

int main()
{
char *ptr;
free(ptr);
return 0
}
a) this program will print nothing after execution
b) segmentation fault
c) Aborted (core dumped)
d) none of the mentioned