C ++错误STATUS_ACCESS_VIOLATION

Question

I'm getting that error by running this simplest code:

#include "stdio.h"
#include "stdlib.h"

int main()
{
    FILE* in;
    FILE* out;

    in = fopen("foo.in", "r");
    out = fopen("bar.out", "w+");

    int something;
    fscanf(in, "%i", something);
    fprintf(out, "%i", something);

    fclose(in);
    fclose(out);
    return 0;
}

I'm running it out of Sublime Text 3.

Answer 1

fscanf expects a pointer, meaning that it modify the value of something while in the function fscanf if you send it by copy the value will be correct while in scope (ie while in fscanf ) but the result is never returned so your copy of something is never changes, (ie it's still not initialized).

so what you need to do:

int something;
fscanf(in, "%i", &something);
fprintf(out, "%i", something);

and it should work, if you are trying to read an integer from foo.in and write it to bar.out .