int x, y;
printf("Enter two positive numbers");
printf("The swapped numbers are %d and %d",x,y);
/* Comments: Let x=3 and y=4;
so y=x+y will give y= 3+4 y=7 x=3
x=y-x will give x = 7-3 x=4 y=7
Finally y=y-x will give y= 7-4 y=3 x=4
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