#include <stdio.h> void fun( int *a, int *b ) { int *k; k = a; a = b; b = k; } main() { int a = 3, b = 6, *x = &a, *y = &b; fun( x, y ); printf( "No.1: %d,%d ", a, b ); fun( &a, &b ); printf( "No.2: %d,%d\n", a, b ); }

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