Program Development Cycle

Prof. Carlos Rodríguez Sánchez

Program Planning(oriented to objects)

• Analyze

• Design

• Choose the interfase

• Code

• Test & debug

• Complete the documentation

Examples:

• How fast is a car traveling if it goes 50 miles in 2 hours?

• Formula:

rate = distance / time

• Rate = 50 miles / 2 hours

• Rate = 25 mph

• How much postage to put on the envelope when you mail a letter?

• Rule = 1 stamp for every 5 sheets of paper or fraction

• Algorithm:– Request the number of sheets

– Divide by 5

– Round the quotient up the next highest whole number

Algorithm

• Request the number of sheets of paper; call it SHEETS (input)

• Divide SHEETS by 5 (processing)

• Round the quotient up to the next highest whole

number; call it STAMPS (processing)

• Reply with the number STAMPS (output)

We can test the algorithm for a letter with 16 sheets of paper.

Performing a Task on the Computer

• INPUT

• PROCESSING

• OUTPUT

Programming Flowcharts

• Representación gráfica de un algorítmo

• Utiliza símbolos estandarizados

FlowchartSTART

SHEETS

STAMPS = SHEETS / 5

ROUND (STAMPS)

STAMPS

STOP

Símbolos Principales