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If the condition is true, then the lines of code inside the loop are executed. The condition part checks a certain condition and exits the loop if false, even if the loop is never executed. If multiple variables are declared, they should all be of the same type. In the initialization part, any variables needed are declared (and usually assigned values). This type of 'semicolon loops' came from B programming language and it was originally invented by Stephen Johnson. It requires 3 parts: the initialization ( loop variant), the condition, and the advancement to the next iteration.

Some languages require a separate declaration of the control variable, some do not.ДЄnother form was popularized by the C programming language. An optional step-value (an increment or decrement в‰ 1) may also be included, although the exact syntaxes used for this differs a bit more between the languages. last do statementДepending on the language, an explicit assignment sign may be used in place of the equal sign (and some languages require the word int even in the numerical case).

5.20 1991: Oberon-2, Oberon-07, or Component PascalДЇor i = first to last do statement (* or just *) for i = first.

5 Timeline of the for-loop syntax in various programming languages.

In FORTRAN and PL/I, the keyword DO is used for the same thing and it is called a do-loop this is different from a do-while loop. The loop body is executed 'for' the given values of the loop variable, though this is more explicit in the ALGOL version of the statement, in which a list of possible values and/or increments can be specified. The term in English dates to ALGOL 58 and was popularized in the influential later ALGOL 60 it is the direct translation of the earlier German fГјr, used in Superplan (1949вЂ“1951) by Heinz Rutishauser, who also was involved in defining ALGOL 58 and ALGOL 60. The name for-loop comes from the word for, which is used as the keyword in many programming languages to introduce a for-loop. For-loops can be thought of as shorthands for while-loops which increment and test a loop variable. For-loops are typically used when the number of iterations is known before entering the loop. The header often declares an explicit loop counter or loop variable, which allows the body to know which iteration is being executed. There are other possibilities, for example COBOL which uses 'PERFORM VARYING'.ДЄ for-loop has two parts: a header specifying the iteration, and a body which is executed once per iteration. Various keywords are used to specify this statement: descendants of ALGOL use 'for', while descendants of Fortran use 'do'. 109535).In computer science, a for-loop (or simply for loop) is a control flow statement for specifying iteration, which allows code to be executed repeatedly. Before placing in container D, check the pH with pH Universal indicator strips (Cat.No. To neutralize alkyl sulfates, add dropwise (from a dropping funnel) to concentrated ice-cool Ammonia solution (Cat.No.

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Alkyl sulfates are carcinogenic Take particular care to avoid inhalation and skin contact. P308 + P313: IF exposed or concerned: Get medical advice/ attention.Д© Carcinogenic compounds and flammable compounds labelled 'Highly toxic' or 'Toxic': container F. P301 + P312: IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell. P260: Do not breathe dust/ fume/ gas/ mist/ vapours/ spray.

P202: Do not handle until all safety precautions have been read and understood. P201: Obtain special instructions before use. H411: Toxic to aquatic life with long lasting effects. H373: May cause damage to organs through prolonged or repeated exposure. H341: Suspected of causing genetic defects. N-(2-Chloroethyl)-N,N-dimethylammonium chloride for synthesis.

N-(2-Chloroethyl)-N,N-dimethylammonium chloride Dimethylaminoethyl chloride hydrochloride, N,N-Dimethyl-N-2-chloroethylammonium chloride