#include <stdio.h>

int main()
{
    int x=10;
    int *p=&x;
    *p=20;
    printf ("the value of x is:%d",x);
    return 0;
}

#include<stdio.h>
int main()
{
    int a=20,*p;
    p=&a;
    ++*p
    a=a+5;
    --*p;
    --a;
    printf("%d %d",a,*p);
    return0;
    
}

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