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The second operator, *, is the complement of the & It is a unary operator that returns the value of the object located at the address that follows For example, if m contains the memory address of the variable count, then
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q = *m;
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places the value of count into q Following the preceding example, q will have the value 100 because 100 is stored at location 2000, which is the memory address that was stored in m The operation of the * can be remembered as at address In this case, the statement could be read as q receives the value at address m Unfortunately, the multiplication sign and the "at address" sign are the same, and the bitwise AND and the "address of" sign are the same These operators have no relationship to each other Both & and * have a higher precedence than the binary arithmetic operators Variables that will hold memory addresses, or pointers as they are called in C, must be declared by putting a * in front of the variable name to indicate to the compiler that it will hold a pointer to that type of variable For example, to declare a char pointer variable called pch, you would write
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char *pch;
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Here, pch is not a character, but rather a pointer to a character there is a big difference The type of data that a pointer will be pointing to, in this case char, is called the base type of the pointer However, the pointer variable itself is a variable that will be used to hold the address to an object of the base type Hence, a character pointer (or any pointer, for that matter) will be of sufficient size to hold an address as defined by the architecture of the computer on which it is running The key point to remember is that a pointer should only be used to point to data that is of that pointer s base type You can mix both pointer and nonpointer directives in the same declaration statement For example,
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int x, *y, count;
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declares x and count to be integer types, and y to be a pointer to an integer type Here, the * and & operators are used to put the value 10 into a variable called target:
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#include <stdioh> /* Assignment with * and & */ int main(void)
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2:
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Variables, Constants, Operators, and Expressions
{ THE FOUNDATION OF C++ int target, source; int *m; source = 10; m = &source; target = *m; printf("%d", target); return 0; }
The sizeof Compile-Time Operator
The sizeof operator is a unary compile-time operator that returns the length, in bytes, of the variable or parenthesized type-specifier it precedes For example, assuming that integers are four bytes and doubles are eight bytes, this fragment will display 8 4
double f; printf("%f ", sizeof f); printf("%d", sizeof(int));
Remember that to compute the size of a type, you must enclose the type name in parentheses (like a cast, which is explained later in this chapter) This is not necessary for variable names The principal use of sizeof is to help generate portable code when that code depends upon the size of the built-in data types For example, imagine a database program that needs to store six integer values per record If you want to port the database program to a variety of computers, you must not assume the size of an integer, but determine its actual length using sizeof This being the case, you could use the following routine to write a record to a disk file:
/* Write 6 integers to a disk file */ void put_rec(FILE *fp, int rec[6]) { int size, num; size = sizeof(int) * 6; num = fwrite(rec, size, 1, fp); if(num!=1) printf("Write Error"); }
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