Swapping two values using 3rd variable

 #include<stdio.h>

#include<conio.h>

void main()

{

          int a,b,temp;

          clrscr();

    printf("enter the value of a and b\n");

    scanf("%d%d",&a,&b);

    printf("before swiping value of a=%d & b=%d\n",a,b);

          temp=a;

          a=b;

          b=temp;

    printf("after swiping value of a=%d & b=%d",a,b);

    

    getch();

}

Output : 

enter the value of a and b

34

45

before swiping value of a=34 & b=45

after swiping value of a=45 & b=34

[Process completed (code 10) - press Enter]