Latest TCS Aptitude Question SOLUTION: Write a program to swap two numbers without using a temporary variable.

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(#M40165230) TCS Programming question Technical MCQ Keep an EYE

Write a program to swap two numbers without using a temporary
variable.

Asked In TCS Ashish (7 years ago)

Unsolved Read Solution (25)

Is this Puzzle helpful?   (31)   (3) Submit Your Solution Variables

Read Solution (25) :

jebin  (7 years ago)

#include
#include
int main()
{
int x = 10, y = 5;
printf("numbers are x=%d ,y=%d",x,y);
// Code to swap 'x' and 'y'
x = x + y; // x now becomes 15
y = x - y; // y becomes 10
x = x - y; // x becomes 5

printf("After Swapping: x = %d, y = %d", x, y);

return 0;
}

Is this solution Helpfull? Yes (6) | No   

ANONYMOUS  (7 years ago)

void main()
{
int a,b;
scanf("%d%d",&a,&b);
a=a+b;
b=a-b;
a=a-b;
printf("%d %d",a,b);
}

Is this solution Helpfull? Yes (2) | No   

SOUMYADEEP SEN  (7 years ago)

#include
int main()
{
int a=10, b=15;
a=a+b-(b=a);
printf("a=%d b=%d" ,a, b);
return 0;
}

Is this solution Helpfull? Yes (2) | No   

amrutha mani sai  (6 years ago)

we can write like this
a=a+b
b=a-b
c=a-b


or u can change the given numbers into binary and u can use a logic
A=A XOR B
B=A XOR B
A=A XOR B

Is this solution Helpfull? Yes (1) | No   

amrutha mani sai  (6 years ago)

sry there was a change in first logic
a=a+b
b=a-b
a=a-b

Is this solution Helpfull? Yes (1) | No   

DHEERAJ DM  (6 years ago)

method 1: Use XOR operation
a=a^b
b=a^b
a=a^b
method 2:
a=a+b
b=a-b
a=a-b

Is this solution Helpfull? Yes (1) | No   

HARISH KUMAWAT  (6 years ago)

#include

int main() {
int x=10,y=15;
printf("before swaping numbers a=%d, b=%d",x,y);
x=x+y;
y=x-y;
x=x-y;
printf("nafter swaping number is a=%d , b=%d",x,y);
return 0;
}

output:-

before swaping numbers a=10, b=15
after swaping number is a=15 , b=10

Is this solution Helpfull? Yes (1) | No   

Jasneet Dua  (7 years ago)

#include
#include
void
main ()
{

int a, b;

printf ("Enter a and b : ");

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


a = a + b;

b = a - b;

a = a - b;


printf ("nnAfter Swapping a = %d , b = %d", a, b);



}

Is this solution Helpfull? Yes | No   

sukanya kumari  (7 years ago)

a=a+b;b=a-b;a=a-b;

Is this solution Helpfull? Yes | No   

YOGENDRA SINGH RAHTORE  (7 years ago)

use concept---
int a=5,b=6;
a=a+b;
b=a-b;
a=a-b;

Is this solution Helpfull? Yes | No   

Manika Garg  (7 years ago)

b=a+b;
a=b-a;
b=b-a;

Is this solution Helpfull? Yes | No   

A.Haritha  (6 years ago)

void main()
{
int a,b,t;
a=5;
b=6;
swap(int a,int b)
{
t=a;
a=b;
b=t;
}

Is this solution Helpfull? Yes | No (4)  

krishna manvitha palchuri  (6 years ago)

a = a+b
b = a-b
a = a-b

Is this solution Helpfull? Yes | No   

Himanshu shekhar  (6 years ago)

without using the third variable
> take the input and b.
>put, a=a+b;
>put,b=a-b;
>put, a=a-b;
.print a and b

Is this solution Helpfull? Yes | No   

Dampetla kaivalya  (6 years ago)

This question can be easily solved using boolean 'xor' operation
//let a=2, b=3
a= a^b; //a=1 (2 xor 3)
b= a^b; //b=2 (1 xor 3)
a= a^b; //a=3 (1 xor 2)
//Hence swapped

Is this solution Helpfull? Yes | No   

Vinothkumar  (6 years ago)

value1=40 , value2=30
value1=(value1+value2)-value1
value2=(value1+value2)-value2

Is this solution Helpfull? Yes | No   

Ramisetty Lavanya  (6 years ago)

#include
int main()
{
int x=12;
int y=10;
x=x*y;
y=x/y;
x=x/y;
printf("After swaping:n x=%d y=%d",x,y);
}

Is this solution Helpfull? Yes | No   

sowmya  (6 years ago)

a=a+b;
b=a-b;
a=a-b;

Is this solution Helpfull? Yes | No   

Mounika  (6 years ago)

a=a+b;
b=a-b;
a=a-b;

Is this solution Helpfull? Yes | No   

Ashutosh  (6 years ago)

int a,b,c;
a= 5;
b=10;

a = a + b;
b = a - b;
a = a - b;

Is this solution Helpfull? Yes | No   

Ravi Varma Kumar  (6 years ago)

Python :

x,y = y,x
print(x)
print(y)

Is this solution Helpfull? Yes | No   

Gaurang Pramod Kadam  (6 years ago)

//python implementation:
a=3
b=5
print("before swapping a is "+ str(a) +" & b is " + str(b) )
a,b=b,a
print("after swapping a is "+ str(a) +" & b is " + str(b) )

Is this solution Helpfull? Yes | No   

jayavarthne kalyanasundaram  (5 years ago)

Let the numbers be x and y,
x=x+y;
y=x-y;
x=x-y;

Is this solution Helpfull? Yes | No   

umesh kumar  (5 years ago)

#include
int main()
{
int n1=3,n2=4;
printf("after swape %d ,%d"n1,n2);
n1=n1+n2;
n2=n1-n2;
n1=n1-n2;
printf("after swape %d ,%d"n1,n2);
return 0;
}

Is this solution Helpfull? Yes | No   

Bipasha Pal  (5 years ago)

#include
int main()
{
int a,b;
scanf("%d%d",&a,&b);
a=a+b;
b=a-b;
a=a-b;
printf("%d%d",a,b);
return 0;
}

Is this solution Helpfull? Yes | No   

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