Flowcharts So let’s say we want to express the following algorithm to print out the sum of the biggest and smallest of three numbers.

Flowcharts So let’s say we want to express the following algorithm to print out the sum of the biggest and smallest of three numbers

Read in A, B and C

START A>B? Read in A, B and C

START A>B? Read in A, B and C Yes A>C?

START A>B? No Read in A, B and C Yes A>C?B>C?

START A>B? No Read in A, B and C Yes A>C?B>C? Biggest = C No

START A>B? No Read in A, B and C Yes A>C?B>C? Biggest = ABiggest = C Yes No

START A>B? No Read in A, B and C Yes A>C?B>C? Biggest = ABiggest = CBiggest = B Yes No

Yes B<C?

A>B? Yes B<C?A<C? No

A>B? No Yes B<C?A<C? No

A>B? No Yes B<C?A<C? Smallest = C No

A>B? No Yes B<C?A<C? Smallest = ASmallest = C Yes No

A>B? No Yes B<C?A<C? Smallest = ASmallest = CSmallest = B Yes No

A>B? No Yes B<C?A<C? Smallest = ASmallest = CSmallest = B Yes No Print Smallest + Biggest

A>B? No Yes B<C?A<C? Smallest = ASmallest = CSmallest = B Yes No Print Smallest + Biggest END

Flowcharts So let’s say we want to express the following algorithm to print out the biggest of four numbers

Read in A, B, C and D

START A>B? Read in A, B, C and D

START A>B? Yes Read in A, B, C and D X = A

START A>B? No Yes Read in A, B, C and D X = A X = B

START A>B? No Yes Read in A, B, C and D X = A X = B C>D?

START A>B? No Yes Read in A, B, C and D X = A X = B C>D? Yes Y = C

START A>B? No Yes Read in A, B, C and D X = A X = B C>D? No Yes Y = C Y = D

Yes Print X

X>Y? No Yes Print X Print Y

X>Y? No Yes Print X Print Y END

Symbols

Terminal Input/Output Operation Process Decision Connector Module Symbols

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