int a = -123;

int * p;

p = &a;

int c= *p + 43;

C的值是-80

#include 
    
      int main(){		int r = 1, a = 2, b = 3;	int *pr = &r;	int *pa = &a;	int *pb = &b;	r = a+b;	printf("r=%d\n",r);	*pr = *pa + *pb;	printf("*pr=%d", *pr);	return 0;}
    

*pr=5

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指针的指针

int 4个字节  double 8个字节  指针4个字节