Swapping two numbers using third variable

 

 C program for Swapping two numbers using third variable

C Program:

#include<stdio.h> #include<conio.h> int main() { int a,b,c; printf("enter the numbers a and b:"); scanf("%d %d",&a,&b); c=a; a=b; b=c; printf("Numbers after swapping:\na=%d \nb=%d",a,b); return 0; }

Output 1:

From the above program,

ü Let a=7 and b=5.

ü Let c be the third variable used for swapping the numbers.

c=a	a=b	b=c
c=7	a=5	b=7

ü a's value will be first assigned to the variable c, then b's value assigned to the a variable, now b's value overwrites the a's value.

ü now b's value will be overwritten by the c's value which is actually the a's value.