A flowchart is a means of visually presenting the flow of data through an information processing systems, the operations performed within the system and the sequence in which they are performed.
Basic flowchart symbols:
Rules:- The usual direction of the flow of a procedure or system is from left to right or top to bottom.
- Only one flow line should come out from a process symbol.
- Only one flow line should enter a decision symbol, but two or three flow lines, one for each possible answer, should leave the decision symbol.
- Only one flow line is used in conjunction with terminal symbol
Example of a flowchart for a coin toss where heads means Mary pays for the pizza and Tales means Bill pays. 
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