C Programming

[Mohan Giri]

Hi Everyone,
I write a program to add 4 digit numbers. When I compile a program I didn't get any error message. But When I run the program I am getting message like

"segmentation fault". Anybody can find any logical error in my program.

For Information. I am compiling the codes using inbuilt compiler in Redhat Linux machine.

my code is

int i,no;
float sum = 0;
scanf("%d",&no);
for(i=1;i<=4;i++)
{
sum=sum+no%10;
no=no/10;
}
printf("Sum=%f",sum);

[bla!!]

I have no idea what would be wrong with that.
I compiled it using the gcc compiler and it worked perfeclty.

Even the fact that scanf doesn't check for wrong input, in this case it will either cast a non-int to an int, or interpret a string as its numerical value.

Maybe post the entire function to see if something else is causing it.

[ashishjha54]

segmentation fault occurs when a program tries to access restricted part of memory.you can correct it easily.

[bla!!]

Yes, but how is this function accessing any memory other than its own?

From what we're given, it's a straight forward calculation. It doesn't recurse, and the function scanf prevents buffer overflows (for the most part).

I don't see how this function could wind up accessing any memory other than its own given to it by the OS.

[ewomack]

Try a different complier and see if you get the same results.

Or, you could use pointers to see where the info is going; maybe you'll be surprised?

[f11m]

someone tell me what scanf does

[Mohan Giri]

scanf stores value which we enter through keyboard into memory in the location of no's address