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int* ip; int num = 10; ip = #

puts into ip the memory address of the variable num This address is the location of the variable in the computer s internal memory It has nothing to do with the value of num Thus, ip does not contain the value 10 (num s initial value) It contains the address at which num is stored The operation of & can be remembered as returning the address of the variable it precedes Therefore, the preceding assignment statement could be verbalized as ip receives the address of num The second operator is *, and it is the complement of & It is a unary operator that evaluates to the value of the variable located at the address specified by its operand That is, it refers to the value of the variable pointed to by a pointer Continuing with the same example, if ip contains the memory address of the variable num, then

int val = *ip;

will place into val the value 10, which is the value of num, which is pointed to by ip The operation of * can be remembered as at address In this case, then, the statement could be read as val receives the value at address ip The * can also be used on the left side of an assignment statement In this usage, it sets the value pointed to by the pointer For example,

= 2 2

*ip = 100;

This statement assigns 100 to the variable pointed to by ip, which is num in this case Thus, this statement can be read as at address ip, put the value 100

// Demonstrate the index-range array class RangeArrayDemo { static void Main() { RangeArray ra = new RangeArray(-5, 5); RangeArray ra2 = new RangeArray(1, 10); RangeArray ra3 = new RangeArray(-20, -12); // Demonstrate ra ConsoleWriteLine("Length of ra: " + raLength); for(int i = -5; i <= 5; i++) ra[i] = i; ConsoleWrite("Contents of ra: "); for(int i = -5; i <= 5; i++) ConsoleWrite(ra[i] + " "); ConsoleWriteLine("\n"); // Demonstrate ra2 ConsoleWriteLine("Length of ra2: " + ra2Length); for(int i = 1; i <= 10; i++) ra2[i] = i; ConsoleWrite("Contents of ra2: "); for(int i = 1; i <= 10; i++) ConsoleWrite(ra2[i] + " "); ConsoleWriteLine("\n"); // Demonstrate ra3 ConsoleWriteLine("Length of ra3: " + ra3Length); for(int i = -20; i <= -12; i++) ra3[i] = i; ConsoleWrite("Contents of ra3: "); for(int i = -20; i <= -12; i++) ConsoleWrite(ra3[i] + " "); ConsoleWriteLine("\n"); } }

YOU TRY IT Calculate the area between y = sin x and y = cos x,

The output from the program is shown here: