C++ Program Concepts

7/31/2019 C++ Program Concepts

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C++ Programming

19/01/12


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A simple C++ program

A simple C++ program which prints "HelloWorld!" on the screen

#include // need this header//file to support the C++ I/O system

using namespace std; // telling the//compiler to use namespace "std",

// where the entire C++ library is declared.


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int main()

{

// Print out a sentence on the screen.// "


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Program for Variables

#include using namespace std;

// declaring a constant. It's value cannot be changed.

const int CONST_VAL = 5;

int main()

{

int iValue; // An integer variable

float fValue; // A floating point variablechar cValue; // A character variable


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iValue = 1234; // Assigns 1234 to iValue

fValue = 1234.56; // Assigns 1234.56 to fValue

cValue = 'A'; // Assigns A to cValue

// Now print them out on the screen:

cout


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Program for operation with variables

#include

using namespace std;

int main ()

{

// declaring variables:

int a, b;

int result;


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// process:

a = 5;b = 2;

a = a + 1;

result = a - b; // print out the result:

cout


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Converts gallons to liters

#include


int main(){

float gallons, liters;

cout


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cin >> gallons; // Read the inputs from the user

liters = gallons * 3.7854; // convert to liters

cout


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Program for Array

#include


int main ()

{int age[10];int i,sum=0, avg=0;

int max=0,min=100;


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for(i=0;i


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if(age[i]>max)

{max=age[i];

}

if(age[i]


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avg=sum/10;

cout


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Program for calculating length of string

#include


int main()

{

char name[15];

int i=0;

cout name;


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while(name[i]!='\0')

{

i++;}

cout


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Program for Display a triangle using for

loopfor (int i = 0; i= 0 ; j--)

{

cout


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calculates the average of the elements

of the row of the two dimensional

array#includeusing namespace std;

int main ()

{

int age[2][5]= { {12,13,14,15,15}, { 12,16,17,13,12}};

int i,j;int sum=0,avg=0;


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for(i=0;i


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A program which illustrates the

working of pointer arithmetic

#include


Int main ()

{

int *x;

int *p,*q;

int c=100,a;

x=&c;

p=x+2;

q=x-2;

a=p-q;


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cout


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A program which illustrates the

working of arrays and pointers

#include


int main()

{int age[5];

int *p;

int sum=0,i;

char yes='y';p=age;


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for(i=0;i


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Program for Function Prototuping

#includeusing namespace std;

int factorial(int n);

int main (){

int n1,fact;

cout


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fact=factorial(n1);

cout


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else

{for(i=1;i


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Parameter passing mechanism

Pass by value

Pass by reference


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Pass by value

#include


int add(int n);

int main(){

int number,result;

number=5;

cout


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cout


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Pass by reference

#includeusing namespace std;

int add(int &number);

int main ()

{

int number;

int result;

number=5;

cout


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result=add(&number);

cout


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Thats all .

Thanks !!

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C++ Program Concepts