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C++ Passing Pointers to Functions C++ allows you to pass a pointer to a function. To do so, simply declare the function parameter as a pointer type. Following a simple example where we pass an unsigned long pointer to a function and change the value inside the function which reflects back in the calling function: #include #include using namespace std; void getSeconds(unsigned long *par); int main () { unsigned long sec; getSeconds( &sec ); // print the actual value cout
C++ The function which can accept a pointer, can also accept an array as shown in the following example: #include using namespace std; // function declaration: double getAverage(int *arr, int size); int main () { // an int array with 5 elements. int balance[5] = {1000, 2, 3, 17, 50}; double avg; // pass pointer to the array as an argument. avg = getAverage( balance, 5 ) ; // output the returned value cout
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About the Tutorial C++ is a middle-
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Enumerated Types ..................
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Function Declarations .............
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Structures as Function Arguments ..
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Data Encapsulation Example ........
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My First CGI program ..............
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C++ The ANSI standard has been stab
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C++ C++ Compiler: This is an actual
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3. BASIC SYNTAX C++ When we conside
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C++ add(x, y); A block is a set of
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C++ ??= # ??/ \ ??' ^ ??( [ ??) ] ?
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C++ cout
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C++ The following table shows the v
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C++ typedef int feet; Now, the foll
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C++ type variable_list; Here, type
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C++ Same concept applies on functio
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C++ Global Variables Global variabl
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8. CONSTANTS/LITERALS C++ Constants
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C++ \a Alert or bell \b Backspace \
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C++ } cout
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C++ j = 50000; i = j; cout
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C++ The static storage class instru
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C++ extern int count; void write_ex
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C++ ++ Increment operator, increase
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C++ operand is greater than or equa
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C++ Line 5 - b is either greater th
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C++ Bitwise operator works on bits
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C++ c = ~a; // -61 = 1100 0011 cout
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C++ Copy and paste the following C+
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C++ Condition ? X : Y Conditional o
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C++ int b = 10; int c = 15; int d =
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C++ do...while loop Like a ‘while
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C++ } return 0; When the above code
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C++ { } cout
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C++ } When the above code is compil
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C++ 2 is prime 3 is prime 5 is prim
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C++ Example #include using namespa
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C++ the ‘for’ loop are required
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C++ for equality against a list of
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C++ When the above code is compiled
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C++ An if can have zero to many e
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C++ switch(expression){ case consta
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C++ case 'D' : cout
Page 92 and 93: C++ C++ specifies that at least 256
Page 94 and 95: 14. FUNCTIONS C++ A function is a g
Page 96 and 97: C++ Calling a Function While creati
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Page 100 and 101: C++ temp = *x; /* save the value at
Page 102 and 103: C++ int main () { // local variable
Page 104 and 105: C++ Total value is :300 Total value
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Page 108 and 109: C++ double d = 200.374; // mathemat
Page 110 and 111: 16. ARRAYS C++ C++ provides a data
Page 112 and 113: C++ for ( int j = 0; j < 10; j++ )
Page 114 and 115: C++ Multidimensioned arrays may be
Page 116 and 117: C++ Once you store the address of f
Page 118 and 119: C++ { . . . } Way-3 Formal paramete
Page 120 and 121: C++ . . } Second point to remember
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Page 124 and 125: C++ int main () { char greeting[6]
Page 126 and 127: C++ strcat( str1, str2): HelloWorld
Page 128 and 129: 18. POINTERS C++ C++ pointers are e
Page 130 and 131: C++ // print the address stored in
Page 132 and 133: C++ convention, if a pointer contai
Page 134 and 135: C++ int main () { int var[MAX] = {1
Page 136 and 137: C++ Address of var[1] = 0xbfce42d4
Page 138 and 139: C++ Above statement is valid and wi
Page 140 and 141: C++ char *names[MAX] = { "Zara Ali"
Page 144 and 145: C++ } return avg; When the above co
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Page 148 and 149: C++ // declare simple variables int
Page 150 and 151: C++ int temp; temp = x; /* save the
Page 152 and 153: C++ vals[4] = 50 When returning a r
Page 154 and 155: C++ hours:minutes:seconds year\n\0.
Page 156 and 157: C++ using namespace std; int main(
Page 158 and 159: C++ using namespace std; int main(
Page 160 and 161: C++ Error message : Unable to read.
Page 162 and 163: C++ int }book; book_id; Accessing S
Page 164 and 165: C++ using namespace std; void print
Page 166 and 167: C++ #include #include using names
Page 168 and 169: C++ Now, you can use Books directly
Page 170 and 171: C++ Both of the objects Box1 and Bo
Page 172 and 173: C++ created previously. C++ friend
Page 174 and 175: C++ { public: double length; double
Page 176 and 177: C++ internal representation of a cl
Page 178 and 179: C++ A private member variable or fu
Page 180 and 181: C++ You will learn derived classes
Page 182 and 183: C++ Line::Line(void) { cout
Page 184 and 185: C++ Line line(10.0); // get initial
Page 186 and 187: C++ } cout
Page 188 and 189: C++ } cout
Page 190 and 191: C++ } *ptr = len; Line::Line(const
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C++ friend class ClassTwo; Consider
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C++ int main( ) { } cout
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C++ Constructor called. Box2 is equ
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C++ Let us try the following exampl
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C++ }; Box(double l=2.0, double b=2
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24. INHERITANCE C++ One of the most
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C++ Total area: 35 Access Control a
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C++ }; public: int getCost(int area
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C++ 25. OVERLOADING (OPERATOR & FUN
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C++ Box operator+(const Box&, const
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C++ cout
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C++ #include using namespace std;
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C++ Time(int h, int m){ hours = h;
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C++ class Box { double length; doub
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C++ } return 0; When the above code
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C++ } { cout and the stream insert
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C++ Second Distance :F : 5 I : 11 T
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C++ } T2.displayTime(); T2++; T2.di
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C++ The function call operator () c
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C++ int arr[SIZE]; public: safearay
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C++ static int i, j; public: void f
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C++ } When the above code is compil
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C++ return (width * height); } }; c
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C++ As you can see, each of the chi
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C++ Here, you don't need to underst
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C++ Designing Strategy Abstraction
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C++ defined after the public specif
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29. INTERFACES C++ An interface des
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C++ }; int getArea() { return (widt
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30. FILES AND STREAMS C++ So far, w
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C++ You read information from a fil
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C++ File Position Pointers Both ist
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C++ Throwing Exceptions Exceptions
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C++ Because we are raising an excep
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C++ struct MyException : public exc
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C++ double* pvalue = NULL; if( !(pv
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C++ class Box { public: Box() { cou
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C++ // second name space namespace
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C++ } return 0; If we compile and r
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34. TEMPLATES C++ Templates are the
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C++ #include #include #include #
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C++ } } If we compile and run above
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C++ test.p. Now, if you check test.
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C++ #if 0 /* This is commented part
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C++ Above line will be transformed
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36. SIGNAL HANDLING C++ Signals are
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C++ Going to sleep.... Going to sle
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37. MULTITHREADING C++ Multithreadi
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C++ } pthread_exit(NULL); int main
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C++ int i; } for( i=0; i < NUM_THRE
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C++ // Initialize and set thread jo
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38. WEB PROGRAMMING C++ What is CGI
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C++ Options All Here, I assume th
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C++ Variable Name Description CONTE
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C++ if ( value != 0 ){ cout
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C++ You can pass information by sim
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C++ First Name: Last Name: Her
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C++ cout
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C++ if( !fi->isEmpty() && fi != (*f
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C++ Passing Dropdown Box Data to CG
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C++ Domain: This is the domain
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C++ Cgicc cgi; const_cookie_iterato
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C++ #include #include #include #
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39. STL TUTORIAL C++ Hope you have
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C++ value of vec [1] = 1 value of v
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C++ The Localization library Exc
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