Student Grade Average

This program calculates and prints a student grade average from five individual scores. It prompts the user to enter a date, a student name, and five numeric scores via INPUT statements, then echoes each entry to the printer with LPRINT. After all scores are collected, it computes the total with a single LET statement and divides by five to produce an average, which is printed in a summary report. The program loops continuously via GOTO 20, allowing multiple students to be processed in sequence, and uses CLEAR before each new iteration to free string storage.

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Program Analysis

Program Structure

The program is organised into a clear linear sequence with a continuous loop. Line numbering uses large, irregular gaps (e.g. jumping from 32 to 2500, then incrementing by 1 for related sub-steps), which is a common informal style rather than a deliberate design. The overall flow is:

1. Lines 10–32: Print header and collect/print the date.
2. Lines 2500–4002: Collect student name and five scores, echoing each to the printer via LPRINT.
3. Lines 5000–6000: Spacing and summary header.
4. Lines 7000–7001: Compute total (E) and average (A).
5. Lines 8000–8020: Print average, clear memory, and loop back to line 20.
6. Lines 8900–9000: Utility lines for saving and listing.

Input and Output Strategy

Every data item entered via INPUT is immediately echoed to the printer with a paired LPRINT statement. This mirrors the entered data onto paper as a record, since the screen display alone would be lost on the next iteration. The date is only collected once at line 31 and printed once at line 32, but the loop at line 8020 returns to line 20, meaning the date header is re-printed to the printer for every student — potentially cluttering the printout if many students are processed.

Calculation

The average is computed across exactly five scores using two LET statements at lines 7000–7001. The intermediate sum variable E is retained but only A (the average) is printed. There is no rounding applied; the result will be printed with full floating-point precision as provided by the runtime.

Variable Summary

Variable	Purpose
D$	Date string entered by user
N$	Student name
E1–E5	Individual scores (numeric)
E	Sum of all five scores
A	Calculated average

Notable Techniques and Idioms

• CLEAR at line 8010 is used before looping. This resets all variables and frees string storage, which is a standard housekeeping practice in looping programs that repeatedly assign string variables like N$ and D$.
• The blank PRINT statements at lines 2650, 2651, 5000, and 5001 produce empty lines for visual spacing on screen.
• Lines 8900 (SAVE) and 9000 (LIST) are utility lines intended to be run manually by the user and are never reached by the normal program flow.

Bugs and Anomalies

• The loop returns to line 20 rather than line 2500, so the “STUDENT GRADE AVERAGE” header and the date prompt are re-issued on every iteration. The date would need to be re-entered for each student, which is likely unintentional. A loop back to line 2500 would be more practical for batch use.
• There is no validation of score inputs; non-numeric entries would cause an error.
• The number of scores is hardcoded to exactly five with no facility for fewer scores or an absent result.