25 posts tagged with "C++"

To ensure that the addresses of two different objects will be different C++ compiler will allocate one byte of memory. The below sample code explains clearly. Because of this behaviour the addresses of class X objects are not equal even though there is no data present in the class X.

class X {

};

class Y {

};

void main() { 
  X objX1, objX2; Y objY;

cout<<"size of objX1: "<<sizeof(objX1)<<endl; //Output: 1 
cout<<"size of objY: "<<sizeof(objY)<<endl; //Output: 1

//Addresses
 cout<<"Address of objX1: "<<&objX1<<endl; 
 cout<<"Address of objX2: "<<&objX2<<endl;

cout<<"Address of objY: "<<&objY<<endl;

if(&objX1 == &objX2) { 
  cout<<"Never Happens"; 
  }
}

4. Swap of two numbers  with out temp​

#include "stdio.h";

int main()
{
  int a,b;
  a=10;
  b=20;
  printf("Before swapingn");
  printf("%dt%dn",a,b);

  /* normal temp
  int temp;
  temp=a;
  a=b;
  b=temp;

  //sol:-1
  a=a+b;
  b=a-b;
  a=a-b;

  //sol:-2
  a=ab;
  b=a/b;
  a=a/b;/

  //sol:-3
  //a^=b^=a^=b;

  a= a^b;
  b= a^b;
  a= a^b;
  printf("%dt",a);
  printf("After swapingn");
  printf("%dt%dn",a,b);
  return 0;
}

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FILE macro is a Predefined Macros : The name of the current source file. FILE expands to a string surrounded by double quotation marks.

fgetc: Read a character from a stream. returns an integer putchar: Writes a character to a stream

# include "stdio.h"
//Program that outputs its own code 

int main () { 
  FILE *fp; char c;
  fp = fopen(__FILE__,"r");

 while((c=getc(fp))!= EOF) { 
  printf("%c",c); 
  } 
  fclose(fp);
} 

Its very useful to name the Debug version of the exe or DLL with letter "D" appended in-order to avoid confusion between release and debug version of binaries

Steps:

1. Create a console application with name "MyProject"

2. To change the output file name in debug configuration

place D as shown in below figure

Project Project Properties -> Linker -> General -> Output File

Release Version: MyProject Application Name: c:MyProjectReleaseMyProject.exe Debug Version: MyProject Application Name: c:MyProjectDebugMyProjectD.exe

1. How to write a code to count number of characters/Spaces/numbers/special characters present in a sentence.  sentence ="1. GOD IS GREAT !!!"

2. How to insert space between each character in a sentence. sentence ="GOOD MORNING" newsentence = "G O O D  M O R N I N G"

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