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1 checksum
"A calculated value that is used to test data for the presence of errors that can occur when data is transmitted or when it is written to disk. The checksum is calculated for a given chunk of data by sequentially combining all the bytes of data with a series of arithmetic or logical operations. After the data is transmitted or stored, a new checksum is calculated in the same way using the (possibly faulty) transmitted or stored data. If the two checksums do not match, an error has occurred, and the data should be transmitted or stored again. Checksums cannot detect all errors, and they cannot be used to correct erroneous data." -
2 PIC S9(4) COMP Integer
"A 16-bit COBOL data type that represents signed arithmetic operations occupying 2 bytes of storage, and can take on values from -9999 to +9999 or -32768 to +32767. A PIC S9(4) COMP integer is normally analogous to an Integer data type in Microsoft© Visual Basic© and a Short Integer in C when referring to 32-bit." -
3 calculator
"Broadly, any device that performs arithmetic operations on numbers. Sophisticated calculators can be programmed for certain functions and can store values in memory, but they differ from computers in several ways: they have a fixed set of commands, they do not recognize text, they cannot retrieve values stored in a data file, and they cannot find and use values generated by a program such as a spreadsheet." -
4 PIC S9(9) COMP Integer
"A 32-bit COBOL data type that represents a 4 byte signed arithmetic operation, and can take on values from -999999999 to +999999999 or -2147483648 to +2147483647, depending on compiler options. A PIC S9(9) COMP Integer is similar to a Long Integer in C."
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