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How to swap two variables, without using third variable ?
Answers were Sorted based on User's Feedback
Answer / marutikutre
x = y | (y=x)-x;
&
a=a*b/(b=a); provided either of a or b is not 0
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / mrx
In assembly language you could use "xchg" instruction witch
swaps the two variables in one instruction.
/* swaps %dest <-> %source */
xchg %dest, %source
/* inline assambly example for C language */
void swap(int register *x, register int *y)
{
asm("xchg %0, %1;" \
: "=r"(*x), "=r"(*y)
: "0"(*x), "1"(*y)
);
}
This is the fastest method you can achieve in hand
optimization. I think C compiler will do the same trick if
possible.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / simhachalam lakkakula
Answer 4 get fail for the following values
Before: a= 219455078, b= -747788332
After: a= -875186568, b= 1
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / simhachalam lakkakula
Answer 4
Logic:
a=a*b;
b=a/b;
a=a/b;
get fail for the following values
Before: a= 219455078, b= -747788332
After: a= -875186568, b= 1
| Is This Answer Correct ? | 1 Yes | 0 No |
---------------------
a=a*b
b=a/b
a=a/b
---------------------
a=a+b
b=a-b
a=a-b
----------------------
a = a Xor b
b= a Xor b
a= a Xor b
----------------------
all above three methods are correct, i hv checked...
| Is This Answer Correct ? | 2 Yes | 1 No |
Answer / rahul
I am new in C/C++.
How to write the program for second answer. Does it
automatically convert the numbers in binary by using ^ sign.
:}
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / devarajan.k
a[12]=name
b[20]=name
Here the size 12 & 25 has no effect hence we can change
the size
a[]=name
b[]=name
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / poojamnagal
Num1 = 5
Num2 = 7
Num1 = 5+7 = 12
Num2 = 12- 7 = 5
Num1 = 12-5 = 7
So, Now Num1 = 7
Num2 = 5
| Is This Answer Correct ? | 2 Yes | 2 No |
How can I Create a C program in splitting set of characters to specific subsets. Example: INPUT SET OF CHARACTERS: Therefore, my dear brothers and sisters, stand firm. Let nothing move you. Always give yourselves fully to the work of the Lord, because you know that your labor in the Lord is not in vain. SPLIT INTO HOW MANY CHARACTERS PER SUBSETS: 10 OUTPUT: Therefore, my dear b rothers an d sisters, stand fir m. Let not hing move you. Alway s give you rselves fu lly to the work of t he Lord, b ecause you know that your labo r in the L ord is not in vain.
Write a C program to print look and say sequence? For example if u get the input as 1 then the sequence is 11 21 1211 111221 312211 12112221 .......(it counts the no. of 1s,2s etc which is in successive order) and this sequence is used in run-length encoding.
main() { struct date; struct student { char name[30]; struct date dob; }stud; struct date { int day,month,year; }; scanf("%s%d%d%d", stud.rollno, &student.dob.day, &student.dob.month, &student.dob.year); }
main() { char str1[] = {‘s’,’o’,’m’,’e’}; char str2[] = {‘s’,’o’,’m’,’e’,’\0’}; while (strcmp(str1,str2)) printf(“Strings are not equal\n”); }
Develop a routine to reflect an object about an arbitrarily selected plane
How do you write a program which produces its own source code as its output?
#define prod(a,b) a*b main() { int x=3,y=4; printf("%d",prod(x+2,y-1)); }
#include<stdio.h> main() { int a[2][2][2] = { {10,2,3,4}, {5,6,7,8} }; int *p,*q; p=&a[2][2][2]; *q=***a; printf("%d..%d",*p,*q); }
void main() { int i; char a[]="\0"; if(printf("%s\n",a)) printf("Ok here \n"); else printf("Forget it\n"); }
main() { char a[4]="HELLO"; printf("%s",a); }
#include<stdio.h> main() { struct xx { int x; struct yy { char s; struct xx *p; }; struct yy *q; }; }
main() { char not; not=!2; printf("%d",not); }
C Code 
