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C Exercises: Swaps two numbers without using third variable

C Basic Declarations and Expressions: Exercise-55 with Solution

Write a C program that swaps two numbers without using third variable.

Pictorial Presentation:

C Programming: Swaps two numbers without using third variable.

Sample Solution:

C Code:

#include<stdio.h>
int main()
{
int x, y;
printf("Input value for x & y: \n");
scanf("%d%d",&x,&y);
printf("Before swapping the value of x & y: %d %d",x,y);
x=x+y;
y=x-y;
x=x-y;
printf("\nAfter swapping the value of x & y: %d %d",x,y);
return 0;
}

Sample Output:

Input value for x & y: 
Before swapping the value of x & y: 5 7
After swapping the value of x & y: 7 5

Flowchart:

C Programming Flowchart: Swaps two numbers without using third variable

C programming Code Editor:

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C Programming: Tips of the Day

Static variable inside of a function in C

The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().

The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.

The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().

Ref : https://bit.ly/3fOq7XP