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By Richard Fitzpatrick

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Extra resources for Computational Physics: An introductory course

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Note, also, the use of indentation to highlight the executable statements. 707e+00 Of course, the 2, 4, and 1 were entered by the user in response to the programs’s prompts. 8 Control statements It is important to realize that there is more to writing a complete computer program than simply arranging the individual declarations and statements in the right order. Attention should also be given to making the program and its output as readable as possible, so that the program’s function is immediately obvious to other people.

Scanf("%d %lf %lf", &k, &x, &y); are not so mysterious, after all. scanf() is a function which returns data to its calling routine via its arguments (excluding its first argument, which is a control string). Hence, these arguments must be passed to scanf() by reference, rather than by value, otherwise they would be unable to pass information back to the calling routine. , k). Note that since the printf() function does not return any information to its calling routine via its arguments, there is no need to pass these arguments by reference—passing by value is fine.

The advantages are that it allows a single-valued argument to be written as an expression, rather than being restricted to a single variable. Furthermore, in cases where the argument is a variable, the value of this variable is protected from alterations which take place within the function. The main disadvantage is that information cannot be transferred back to the calling portion of the program via arguments. In other words, passing by value is a strictly one-way method of transferring information.

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