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The flowchart became a popular tool for describing computer algorithms, but its popularity decreased in the 1970s, when interactive computer terminals and third-generation programming languages became common tools for computer programming, since algorithms can be expressed more concisely as source code in such languages.
Analizo: calculates source code metrics, generates dependency graphs. CCTree : Native Vim plugin that can display static call graphs by reading a cscope database. Works for C programs. codeviz : a static call graph generator (the program is not run). Implemented as a patch to gcc; works for C and C++ programs.
Flowgorithm can interactively translate flowchart programs into source code written in other programming languages. As the user steps through their flowchart, the related code in the translated program is automatically highlighted. The following programming languages are supported: [4]
Free and open-source software portal; GNU cflow is a flow graph generator that is part of the GNU Project. It reads a collection of C source files and generates a C flow graph of external references. It uses only sources and does not need to run the program.
The reason is that each node in a flowchart represents a program command. A program command is an action to be executed. A command is not a state, but when applied to the program's state, causes a transition to another state. In more detail, the source code listing represents a program graph.
Modern integrated development environments and code-oriented text editors often include a similar feature, now normally referred to as autocomplete. The beginning programmer would first create a flow chart to solve the problem. Since all of the problems involved words (rather than mathematical problems) the solution was intuitive.
Nassi–Shneiderman diagrams are only rarely used for formal programming. Their abstraction level is close to structured program code and modifications require the whole diagram to be redrawn, but graphic editors removed that limitation. They clarify algorithms and high-level designs, which make them useful in teaching.
Some CFG examples: (a) an if-then-else (b) a while loop (c) a natural loop with two exits, e.g. while with an if...break in the middle; non-structured but reducible (d) an irreducible CFG: a loop with two entry points, e.g. goto into a while or for loop A control-flow graph used by the Rust compiler to perform codegen.