regarding memset return value

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C++

int i;
memset(Deviceptr,0*00,sizeof(Deviceptr))
i=Deviceptr[0];

Then

C++

i=?

reply me the answer and explain how

Posted 2-Aug-13 19:46pm

Rajesh Varatharajan

Updated 2-Aug-13 20:45pm

CPallini

v2

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Richard MacCutchan 3-Aug-13 4:21am

i will be zero, the contents of the first cell in the array that you have just cleared to zero. something you could easily confirm just by stepping through your code with the debugger.

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CPallini · Accepted Answer · 2013-08-02T20:44:00

Solution 1

Please note:

Your code won't compile.
You are ignoring memset return value.
You didn't show us the declaration of the Deviceptr variable.

if Deviceptr is an array of integers then i value should be 0.

[update: fixed C code]

C

#include <stdio.h>
#include <memory.h>

#define Max_port 4

int main()
{
    char Deviceptr[Max_port];
    int i;
    memset(Deviceptr,0,sizeof(Deviceptr));
    i=Deviceptr[0];
    printf("i = %d\n", i);
    return 0;
}

[/update]

Posted 2-Aug-13 20:44pm

CPallini

Updated 2-Aug-13 21:37pm

v3

Comments

Rajesh Varatharajan 3-Aug-13 3:21am

char Deviceptr[Max_port];
#define Max_port 4

Rajesh Varatharajan 3-Aug-13 3:23am

write the correct code using memset and the output for that code

CPallini 3-Aug-13 3:37am

I updated my answer.

Rajesh Varatharajan 3-Aug-13 4:40am

Thanks

CPallini 3-Aug-13 5:35am

You are welcome.