int a,b;

main()

{int a,b,t;

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

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

t=a;a=b;b=t;

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

}

main()

{int a,b;

scanf("%d%d",&a，&b)

pintf("a=%d,b=%d",a,b);

}

twr(int a,int b)

{int t;

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

t=a;a=b;b=t;

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

}