Subtracts one integer big number from another.
Syntax
IppStatus ippsSub_BN(IppsBigNumState *a, IppsBigNumState *b, IppsBigNumState * r);
Parameters
a |
First integer big number of the data type IppsBigNumState. |
b |
Second integer big number of the data type IppsBigNumState. |
r |
Subtraction result. |
Description
This function is declared in the ippcp.h file. The function subtracts one integer big number from another regardless of their signs and sizes and returns the result of the operation.
The following pseudocode represents this function:
(*r) ← (*a) - (*b).
Return Values
ippStsNoErr |
Indicates no error. Any other value indicates an error or warning. |
ippStsNullPtrErr |
Indicates an error condition if any of the specified pointers is NULL. |
ippStsOutOfRangeErr |
Indicates an error condition if IppsBigNumState *r is smaller than the result data length. |
Note
The function executes only under the condition that size of IppsBigNumState * r is not less than either the length of IppsBigNumState *a or that of IppsBigNumState *b.