HP 3000 Manuals HP 3000 Manuals
Overflow Conditions Each data type has its own format and range. An overflow condition occurs when numbers outside the range of a particular type are assigned to, or read into, the corresponding variables at run-time. For read operations, an error message is issued and the program terminates unless the ERR or IOSTAT specifier is present. For assignments, truncation occurs. For integer variables, this truncation is performed such that the high order bits are ignored. For REAL*4 variables assigned as REAL*8 values, the low order bits are ignored, preserving the magnitude, but losing the precision. Truncation for complex variables is the same as that for real variables. This process is not to be confused with evaluation of an expression whose result is too large or small for the data type involved, which causes machine errors unless the corresponding ON statement trap has been set.