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Writing to binary files in C

#include <stdio.h> #include <stdlib.h> #include <string.h> typedef struct Point { int x, y; } Point; int main(int argc, char* argv[]) { Point p1 = { .x = 13, .y = -1 }; Point p2; FILE* in; FILE* out; out = fopen("point.bin", "wb"); if (out == NULL) { return 1; } size_t elements_written = fwrite(&p1, sizeof(Point), 1, out); fclose(out); if (elements_written == 0) { return 2; } return 0; }