Flow chart is a graphical representation of a task/job. Flow chart uses different graphical figures to represent individual steps in a task and arrows connect these steps and to represent the direction of the flow.

Flow chart helps programmer to design and imagine the flow of the problem. Once flow chart is prepared programmer can further write pseudo codes. Pseudo codes are not exactly C source code but major steps in C programs. A well-constructed Flow chart and well written pseudo codes are the key to develop a robust program.

Now programmers can write actual source code. Programmers can write input/outputs, decision making blocks, loops and error handing codes easily as everything is there in flowchart. Programmers can debug step by step to verify the flow whether it is following the flowchart. Flowchart and pseudo codes are not compulsory for writing C program but good to have during designing and analysis.

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