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int row, col; // Global variable declaration
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int videoPos(int i int j) { variables int temp; //
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Passed parameters are local
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i = i * 80; temp = I + j; Return temp; } // End videoPos Function
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main() {
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for (row = 0; row < 25; row++ ) for (col = 0; col < 80; col++ ) VideoMemory[videoPos(row , col)] = ; } // End Example Mainline
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The variables row and col are global and can be accessed by any function in the application. The variables i, j, and temp, are local to the videoPos function and can only be accessed within the function. Attempts to access i, j, or temp outside of videoPos will result in error statements indicating that the variables are not recognized. This error can be confusing to new programmers as the variables can be seen by reading through the code.
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Local variable names can be reused in different functions and there will not be any confusion or invalidly passed values by the compiler. For example, in the mainline (main), row and col could be replaced by local variables i and j and execution would not be any different nor would there be any confusion between the values of i and j in main and the values inside videoPos, even if videoPos changed the values of i and j inside its function. The reason the values wouldn t change is because i and j in main are physically different variables in videoPos, even though their names are identical. In many high performance processors (for example, your PC s processor), the local variables are offsets to the data stack, and global variables are placed at static (unchanging) locations in memory. You should avoid having global variables with the same names as local variables. In some compiler implementations the global variables will be used unless they are in a function with local variables with the same name. In others, the global variables will take precedence and the local variables will be ignored. In still others, an error will be generated if there are local variables with the same names as global variables. To be on the safe side, make sure that you never create code with global and local variable names in common. When local variables are stored in and referenced from the data stack the memory required for them is allocated dynamically by the active subroutines as required. The input parameters of a subroutine (i and j in videoPos above) are explicitly pushed onto the stack to reserve (or allocate) space for them when a subroutine is called. When the routine is nished, the values are popped off the stack to free up the space that was used by them. If you are familiar with the concept of garbage collection (freeing up memory no longer required by subroutines), you will realize that this is quite an ef cient way of executing; once the memory is no longer required for local variables, it is returned to the stack automatically at the end of the subroutine without the need for any other operations. Local variables inside a function are relative to the current stack position, and when they are to be accessed, the offset to the data stack must be calculated. The operation of videoPos can be illustrated using pseudoassembler code:
Main: : ; VideoMemory[videoPos(row , col)] = ; push row ; Parameters Pushed in Same Order as in push col ; Subroutines call videoPos pop _____ ; Restore the stack to the precall value pop _____ videoPos(int i, int j) int temp; push #0
De ne temp
i = i * 80 move accumulator, (sp - 3); mul accumulator, #80
Get rst Parameter ( i ) from stack
SOFTWARE DEVELOPMENT TOOLS
move (sp - 3), accumulator stack
Store the Result back onto the (in i )
temp = i + j move accumulator, (sp - 3) add accumulator, (sp - 2) move (sp - 1), accumulator ; ; ; Load Accumulator with I Add j to Accumulator Save the Result in temp
return temp pop accumulator ; ; ; Restore the Stack to its Original Value and load the Accumulator with temp End of videoPos
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