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What is typedef?

#include <stdio.h> #include <stdlib.h> #include <string.h> typedef unsigned long long UINT64; typedef struct Point { double x, y; } Point; int main(int argc, char* argv[]) { Point p; p.x = 0.24; p.y = 0.78; printf("%lf %lf\n", p.x, p.y); UINT64 l = 14; printf("%llu\n", l); return 0; }

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