Help with few programs..

**appunu** · 05-12-2010

I came across an interview process and i couldn able to answer few of their questions. But i want to enlighten myself with the answers of the questions.. plz help me with the answers to those questions. .. . .

1 . Program to truncate a given floating point value (e.g.16.25=16). You should not assign the float value to integer & then copy the int value to float….

2 . Program to find the position of decimal point in a given floating point value.

3. Program to swap two numbers without using assignment operator in any part of the program.

i answered others questions ... but found it confusing

**GL.Sam** · 05-12-2010

In order to answer the first two questions you need to know how float is represented internally. Here's a handy link:
Clusty Search Â» ieee floating point

>3. Program to swap two numbers without using assignment operator in any part of the program.
It could be done using XOR.

EDIT: Oh, I thought "without temp variable" lol.

**appunu** · 05-12-2010

i found out the answer for the 3rd question..
u could use inline asm code ...

like asm mov ax,a

this will solve that assingment operator problem..

**Brafil** · 05-12-2010

I'm sure it won't.

**appunu** · 05-12-2010

Originally Posted by Brafil

I'm sure it won't.

got any idea other than that ?? ? ? ??!?!

**GL.Sam** · 05-12-2010

>3. Program to swap two numbers without using assignment operator in any part of the program.
Okay, the only thing that came into my mind is to read values from file/stdin, then make a temporary file, write them there, and read backwards. Looks dumb, but as for me, the very question looks pretty dumb either.

**appunu** · 05-12-2010

#include < stdio.h >
#include < conio.h >
void main()
{
int a,b;
clrscr();
printf("\nEnter variables to swap-->");
scanf("%d %d",&a,&b);
printf("\nBefore swapping:- %d %d",a,b);
asm mov AX,a;
asm mov BX,b;
asm mov b,AX;
asm mov a,BX;
printf("\nAfter swapping :- %d %d",a,b);
getch();
}

**Brafil** · 05-12-2010

GL.Sam had already posted the solution - simply XOR the two numbers, but beware, if they are the same, they will both be 0. I think this is what your instructors want - just google "xor swap".

**appunu** · 05-12-2010

Originally Posted by Brafil

GL.Sam had already posted the solution - simply XOR the two numbers, but beware, if they are the same, they will both be 0. I think this is what your instructors want - just google "xor swap".

XOR will still require an assignment statement " = " .

**Brafil** · 05-12-2010

No. You can use "^=", which is a compound operator.

**brewbuck** · 05-12-2010

Originally Posted by Brafil

No. You can use "^=", which is a compound operator.

I'd consider that an assignment operator...

**GL.Sam** · 05-12-2010

I've found it

Code:

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

int main(void)
{
	int a, b, temp;

	scanf("%d %d", &a, &b);

	memcpy(&temp, &a, sizeof(int));
	memcpy(&a, &b, sizeof(int));
	memcpy(&b, &temp, sizeof(int));

	printf("%d %d\n", a, b); 

	return 0;
}

**quzah** · 05-12-2010

It kinda takes away from the whole "homework" aspect if you just show up and someone else does everything for you.

Quzah.

**appunu** · 05-12-2010

Originally Posted by quzah

It kinda takes away from the whole "homework" aspect if you just show up and someone else does everything for you.

Quzah.

dude.. i said it was asked on my interviews. It was not an homework btw and am not a kid going to school. I just messed up that interview coz these kinds of logical questions.. i want to make myself clear thats why posted here.. :|

**quzah** · 05-12-2010

Maybe you should go to school. I mean, you're interviewing for some sort of programming job, but you don't know how to program.

Quzah.

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