Debugging a CA Culprit Report › Printing Additional Report Information › Demonstration

Demonstration

Objective

This example lists values obtained while computing the volume of a sphere, in cubic centimeters, from diameters measured in inches. The program releases a detail line after every second arithmetic operation.

Procedure

The program issues several arithmetic instructions to compute the volume of the sphere. CA Culprit automatically rounds the result of a calculation. As the results below indicate, the code should specify truncation for the arithmetic operations in this example.

Code

 col. 2
 ▼
IN 80
REC TANK-DIA-IN  1  3
010 RADIUS-IN
010 RADIUS-CM
010 WORK-FLD
010 CUBIC-CM
013 CALCULATING THE CC VOLUME OF A SPHERE FROM A DIAMETER IN INCHES
0152*010 TANK-DIA-IN       HF
0152*020 RADIUS-IN         HF
0152*030 RADIUS-CM         HF
0152*040 WORK-FLD          HF
0152*050 CUBIC-CM          HF
 .
 .
 .
017    TANK-DIA / 2  RADIUS-IN
017    RADIUS-IN X 2.54  RADIUS-CM
017    RELS 2
017    COMPUTE (RADIUS-CM X RADIUS-CM X RADIUS-CM)  WORK-FLD
017    WORK-FLD X 3.1416  WORK-FLD
017    RELS 2
017    WORK-FLD X 4  WORK-FLD
017    WORK-FLD / 3  CUBIC-CM
017    RELS 2
 .
 .
 .

Result

The values released between calculations are:

TANK-DIA-IN    RADIUS-IN    RADIUS-CM    WORK-FLD    CUBIC-CM
    15            8            20
    15            8            20         25,133
    15            8            20        100,532      33,511
    45           24            60        125,665      33,511

The result should have been:

TANK-DIA-IN    RADIUS-IN    RADIUS-CM    WORK-FLD    CUBIC-CM
    15            7.5         19.05
    15            7.5         19.05      21,718.8
    15            7.5         19.05      86,875.2    28,958.4
    45           22.5         57.15     108,594.0    28,958.4

The released values show that rounding occurs in all calculations. Truncation should be indicated in the code for correct results.