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vs工具编译运行报错：未将对象引用设置到对象的实例

//指针的特点：void main() { int* ptr; printf("sizeof(int*)=%d\n", sizeof(int*));//sizeof(int*)=8 printf("sizeof(int)=%d\n", sizeof(int));//sizeof(int)=4 int a = 23; ptr = &a; printf("*ptr=%d\n", *ptr);//*ptr=23 printf("ptr=%d\n"...