Doubt in pointing a variable in c.

Morningdot Hablu · 2011-01-10T23:11:26+00:00

hello friend's, Check these codes... #include<stdio.h> void main() { int *x,p=4; x=&p; printf("%d",*x); } and the 2nd one goes here... #include<stdio.h> void main() { char c[]="mohit kumar singh"; char *str; str=&c; printf("%s",*str); } from the first program i got the output "4". But don't know why 2nd one will show an Segmentation fault. Can anyone tell me the reason for this Segmentation fault...?

Doubt in pointing a variable in c.

Morningdot Hablu
@morningdot-6Xuj4M

Updated: Oct 21, 2024

Views: 880
hello friend's,
Check these codes...
```
#include<stdio.h>
void main()
{
    int *x,p=4;
    x=&p;
    printf("%d",*x);
}
    
```
and the 2nd one goes here...
```
#include<stdio.h>
void main()
{
    char c[]="mohit kumar singh";
    char *str;
    str=&c;
    printf("%s",*str);
}    
```
from the first program i got the output "4".
But don't know why 2nd one will show an Segmentation fault.
Can anyone tell me the reason for this Segmentation fault...?
0

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Gurjeet Singh

Member • Jan 10, 2011
mohit007kumar00
```
#include<stdio.h>
void main()
{
    char c[]="mohit kumar singh";
    char *str;
    str=&c;
    printf("%s",*str);
}    
```
i think you are going to be reading in a valid memory address from the user may be it has already allocated
try to use this --

char *str=malloc(sizeof(char)*250);
scanf(" %c ", str);
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Sahithi Pallavi

Member • Jan 11, 2011

Just a small mistake in your program Mohit.
See this, its working,

#include<stdio.h>
void main()
{
char c[]="mohit kumar singh";
char *str;
str=c;
printf("%s",str);
}

Output : mohit kumar singh
that is percentage s in printf statement.

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Pensu

Member • Jan 11, 2011

I think you cant treat a string as a single integer or character. Check this:

#-Link-Snipped-#

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Sahithi Pallavi

Member • Jan 11, 2011

As per my Knowledge, Segmentation fault occurs if there is any fault in accessing the memory address. If we tried to access the invalid or wrong memory address, then the Segmentation Fault error occurs.

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Gurjeet Singh

Member • Jan 11, 2011

I have run the code and the above solution is working fine 😀

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Morningdot Hablu

Member • Jan 11, 2011

Thanks guy's,
I think *str indicates c[0].So i have to use %c to print the character value but i used %s.

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