Example

int main(int argc, char* argv[]) { double num; printf("double: %1.2f",  num); printf("double: %c",  num); return 0; }

Solution

Make sure you are using the right format string for the given type of argument. int main(int argc, char* argv[]) { double num; printf("double: %1.2f",  num); printf("double: %e",  num); return 0; }