ทำซีโดยอัตโนมัติแปลงเป็นสองเท่าเพื่อน int ได้

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วิธีที่จะแปลงเป็นสองเท่าเพื่อน int ได้อยู่ใน C

double a = 12.34;
int b = a ;
//b = 12 not 12.34

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