Introduction to Imerative Language
Imperative language are characterized by three concepts: various assignment and sequencing. The state of an imperative program is maintained in program variables. These variables are associated with memory locations characterized by an address (I- value ) and by a stored value (r-value). The value of a variable is modified using an assignment statement. The assignment statement introduces an order dependency into the program: the value of a variable is different before and after an assignment statement . therefore the meaning effect of a program depends on the order in which the statements are written and executed. So we can state imperative languages as:
Imperative language are those in which expressions are computed and accordingly their results are assigned in the variables. These language are same as the most of the high level procedure languages.
Because of their characteristics. Imperative languages are also called as state based languages and assignment oriented languages.
Imperative language are : C. C++, Modula 2 , Pascal ,BASIC etc.
Example7 . to find out the addition of three numbers consider example of C languages as shown in fig 6.5,
Here initially res is calculated as the sum of num 1 and num2 and the result of this expression res and num 3 are summed up. This sum is stored in result 1 and at last that result is displayed on the screen.
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