The BCD code (Binary-Coded Decimal) is also known as the binary code decimal or binary code. Use a 4-bit binary number to represent the 10 digits from 0 to 9 in a 1-digit decimal number. It is a binary digitally encoded form with a binary coded decimal code.
BCD code This encoding uses four bits to store a decimal number, allowing fast conversion between binary and decimal.
This coding technique is most commonly used in the design of accounting systems because accounting systems often require accurate calculations of very long strings of numbers.
Compared with the general floating-point notation method, the BCD code can save the accuracy of the value and eliminate the time taken for the computer to perform floating-point operations. In addition, BCD coding is also very common for other calculations that require high precision.
/* Write a function that converts BCD encoded binary numbers to integers. For example, 0x00001234 is converted to 1234. */
1. #include
2. #include
3. int main()
4. {
5. int a = 0x01134568;
6. int i, sum=0;
7. int b = 0;
8. int c = 0;
9. for ( i = 1; i <= 8; i++ )
10. {
11. printf("%x",a);
12. c = a&0x0000000f;
13. if ( i == 8)
14. {
15. if( c == 1)
Break
17. }
18. sum += c * pow(10,i-1);
19. printf("%d", sum);
20. a = a>>4;
twenty one. }
22. if ( c == 1)
twenty three. {
24. printf("-%d", sum);
25. }
26. else
27. {
28. printf("%d", sum);
29. }
30. }
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