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Home/ Questions/How to resolve the error: ''warning: assignment from incompatible pointer type''?
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frankieturner
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frankieturner
Asked: August 4, 20222022-08-04T03:37:34+00:00 2022-08-04T03:37:34+00:00In: Error

How to resolve the error: ”warning: assignment from incompatible pointer type”?

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I still get the ”warning: assignment from incompatible pointer type” error while running my program and I haven’t a clue as to why.

myPageFrame pageFrames[numOfFrames];
myPage pages[numOfPages];

//in a for loop
pageFrames[i].thePage = (myState == HOT ? (&pages[i]) : NULL); // one of the offenders

The structs in question as the below:

//algo_structs.h
typedef struct{

int pageNum;

} myPage;

typedef struct myPage{

struct myPage* thePage;
int loaded;
int lastRef;

} myPageFrame;

Can someone tell me the reason for this error and the way to fix it?

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    hdtutoria Expert
    2022-08-04T03:40:47+00:00Added an answer on August 4, 2022 at 3:40 am

    The cause: This error occurs because you have a struct member of type struct myPage while you’ve defined a type called myPage

    Solution: You can fix the issue by making them the same type by changing the struct definition to:

    typedef struct myPage {
    int pageNum;
    } myPage;

    or you could just use myPage * instead of struct myPage *.

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