Swap numbers with pointers in C

#include<stdio.h>

void swap(int*, int*);

void main()

{

int x=10, y =20 ;

printf("Initial number:%d and %d",x,y);

swap(&x,&y);

printf("\n\nfinal number:%d and %d",x,y);

}

void swap(int*p , int*q)

{

int t=0;

t=*p;

*p=*q;

*q=t;

}

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