Answer / sj

main()
{
int a=20,b=30;
clrscr();
a=a+b;
b=a-b;
a=a-b;
printf("%d%d",a,b);
getch();
}

Answer / deepa

main()
{
int a=20,b=30;
clrscr();
b=a+b;
a=b-a;
b=b-a;
printf("%d%d",a,b);
getch();
}

Answer / rahul

#include<stdio.h>
#include<conio.h>
void main()
{
int a=20,b=30,c;
clrscr();
a=a+b;
b=b+a;
c=a+b;
c=b-a;
printf("swapping two variables using 3rd variable");
scanf("%d%d%d,a,b,c);
getch();
}

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