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Anonymous unions in C

#include <stdio.h> #include <stdlib.h> #include <string.h> typedef struct CustomFloat { bool isExtended; union { float value; double valueExtended; }; } int main(int argc, char* argv[]) { CustomFloat cf, cf2; cf.isExtended = false; cf.value = 12.5f; cf2.isExtended = true; cf2.valueExtended = 0.25; return 0; }