New PDF release: Introduction to Software development

By J. Pérez López and L. Ribas i Xirgo

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This last character is read but it is not stored in the character string of the argument. h for which the value is 0. gets( user_name ); GNUFDL • PID_00148431 30 Summary In this unit we have looked at the execution procedure for programs on a computer. The unit in charge of processing information (central processing unit or CPU) reads an instruction from the memory and executes it. This operation involves a change in the state of the environment of the program, the content of one or more of its variables and the address of the next instruction.

In order to be able to deposit the data in the indicated variables, this function requires that the arguments on the variable list are the memory addresses at which they are to be found. For this reason we need to use the operator "address of" (&). In this way, scanf directly deposits the information it has read in the corresponding memory location, naturally the affected variable will be modified to show the new value. It is important to remember that if we specify less arguments than field specifiers in the format the results may be unpredictable, as the function will change the content of some memory locations in a random way.

2) Read the data required for execution from the memory. 3) Perform the calculation or operation indicated in the instruction and, depending on the operation, save the result in the memory. 4) Determine the next instruction to be executed. 5) Return to the first step. The CPU references the instructions and data requested from the memory and the results it wishes to store using the position number they occupy in the memory. The position occupied by the data and instructions is known as the memory address.

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Introduction to Software development by J. Pérez López and L. Ribas i Xirgo


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