Flowchart in Computer Programming
Input and Output
Generally, you can use Data symbol for input or output actions in your algorithm. Alternatively, you can use the User Input symbol if the input is entered solely by a user. If you want to show the output to the user, you can use Display symbol in your flowchart. The output can be displayed on a screen or printed.
You can use Internal Storage symbol or simple Process symbol for variable declarations.
There is not any specific shape for the assignment statement. If you want to show a variable assignment in your flowchart, you can just use the Process element.
If you want to call another subroutine, procedure, or function, you should use the Predefined Process element.
If and else-if conditions are represented using Flow branches that lead from Decision symbol (diamond). The condition is stated within the diamond shape. The branches are labeled as Yes or True for the met condition and No or False for the else branch.
You can check out our template for multiple else-if branches here.
Switch statement for multiple cases is depicted similarly as an if-condition in flowcharts. The switch variable is given in a Decision diamond. The individual cases are represented by Flow branches. The values of the cases are stated as labels for flow connectors.
The template for switch cases is available here.
The condition for the while loop is displayed inside the Decision symbol. The flow from the last Process element (that represents the last statement within the while loop) points to the starting decision element. The decision element has two flow branches - one leads to while-loop statements (it can be labeled as Yes or True), and the other flow leads out of the loop to the following statements.
The Return statement is depicted using the Flow connector that leads to the End symbol (rounded rectangle, stadium shape).
If you want to translate the Break or Continue statement from a program code into a flowchart, you can do it using the Flow relationship that connects the respective places in the program flow.
If you need to indicate waiting in your algorithm flowchart you should use the Delay symbol. It is a rectangular shape rounded on the right side. The waiting time or the condition when the waiting ends can be expressed inside the Delay shape.