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What does it mean "C is a structured programming language?"

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What does it mean "C is a structured programming language?"
posted May 2, 2016 by anonymous

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It usually means a language that is "block structured", having blocks of code that are treated as a unit for purposes of if/then/else. Blocks are delimited by things like BEGIN/END, DO/DONE, IF/ELSIF/ENDIF, IF/FI, or now commonly curly braces { your; code; here; }. Prior to this, IF's tended to be plain:


Where label A can above or below, anywhere in the translation unit, and that was all there is to the IF.

There was also the more notorious Fortran "computed goto" (from memory):

IF A, B, C

Where A, B and C are labels where ever they may be corresponding to a negative, zero, or positive evaluation result of the expression.

"Structured" languages are characterized by not (usually) needing labels for if operations and loops. Now you can guess C is considered structured language because of the fact that it does not force/require goto (labels) statement for the loops or conditional operation.

answer May 2, 2016 by Rajan Paswan
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