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By Peter D. Hipson

The entire programmer's advisor to C luck. potency tips and strategies for debugging C courses and enhancing their velocity, reminiscence utilization, and clarity. whole insurance of disk records together with sequential entry, textual content, binary and random entry. assurance of the internals of the normal header documents: variable, knowing the prototypes, and precise programming concerns.

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3. continued extern long extern long int int lSum; // Using ‘int’ is optional. C routines to de-sum integers and decrement a counter. C routines to return the average. */ /* Declare the variables that will be shared between these functions. */ extern long extern long int int lSum; // Using ‘int’ is optional. C files are defined—using the extern attribute. This definition tells the compiler what the variables’ attributes are (long int), and tells the compiler not to allocate any memory for these variables.

You must, however, provide the compiler with some more information. You must tell how many of the desired data objects will be found in the array. For example, an array of int may be defined as int nArray[15]; In this declaration, an array of integers has been created (remember that a declaration allocates memory). The first member in the array is addressed as nArray[0], and the final member is addressed as nArray[14]. Here’s an example of one of the most common coding errors: #define int int MAX_SIZE 20 nArray[MAX_SIZE]; i; /* Other lines of code */ 46 Data Types, Constants, Variables, and Arrays CCC CCC C CC 2 for (i = 1; i <= MAX_SIZE; i++) { nArray[i] = i; } In the preceding fragment, the array element nArray[15] is initialized.

2. 2. An example of a global variable, in a single source file. long long int int lSum; // Using ‘int’ is optional. lCount; void SumInt( int nItem) { lSum += (long)nItem; ++lCount; } void SubInt( int nItem) { lSum -= (long)nItem; —lCount; } int Average() { int nReturn = 0; nReturn = (int)(lSum / lCount); return (nReturn); } The preceding code fragment has a set of two functions that add to a sum and count (used to create an average), and return an average. If you look at the Average() function, you may wonder why I thought that I could divide two long (32-bit) integers and be sure that I would get a returned value that fit in a short (16-bit) integer.

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