19 ways to print Hello World with C++

Print Hello World 19 different ways with C++

*Featured Code Created by Morpheus

C++

/* THANK YOU GUYZ FOR SUPPORT & SUGGESTIONS

check out the various methods of printing hello world plz contribute with comments if u hv got other printing ideas tooo */

#include <iostream>

#include <string>

#include <stdio.h>

#include <unistd.h>

//need unistd above for using system call

using namespace std;

int main()

{

//simplest way would be

cout<<"1.Hello World"<<endl;

/*or the old but precise C way with printf but gotta use that #include<stdio.h> at the top*/

printf("2.Hello world\n");

/*puts() function works fine too, but we should avoid using it as it causes lots of warnings in many compilers*/

puts("3.Hello world ");

/*printf can also be used for str7 with %s as format specifier for string type*/

char str7[20] = "4.Hello World";

printf("%s\n",str7);

//first way

string str1="5.Hello World";

cout<<str1<<endl;

// also can consider string as an array, here '\0' is end of string notation

int x=0;

string str9="6.Hello World";

while(str9[x]!='\0')

{

cout<<str9[x];

x++;

}

cout<<endl;

//second way usin characters array

x=0;

char txt[20]={'7','.','H','e','l','l','o',' ','W','o','r','l','d','!'};

while(txt[x]!='!')

{

cout<<txt[x] ;

x++;

}

//third way using for loop when u know the count of char array

char text[20]={'8','.','H','e','l','l','o',' ','W','o','r','l','d'};

cout<<endl;

for(x=0;x<13;x++)

cout<<text[x];

//fourth way using pointer to characters array if u dont know count

x=0;

cout<<endl;

char *p="9.Hello World!";

while(*(p+x)!='!')

{

cout<<*(p+x);

x++;

}

//fifth way extracting from a larger string usin inbuilt substr() function

string largetext="This is the sample large text from which we ll extract this 10.Hello World part";

cout<<endl;

cout<<largetext.substr(60,14);

// here 60 is the starting position of required substring and 14 is no of characters to extract from largetext starting from 60

//sixth way using ASCII codes for charachters

char a=72; // ascii code for H is 72

char b=101; // for e 101 and so on for all

char c=108;

char d=108;

char e=111;

char f=32;

char g=87;

char h=111;

char i=114;

char j=108;

char k=100;

char l=49;

char m=49;

char n=46;

cout<<endl;

cout<<l<<m<<n<<a<<b<<c<<d<<e<<f<<g<<h<<i<<j<<k;

/*seventh way using string concatenation with +

dont forget to include string header to use this overloaded + operator */

string str2 = "12.Hello ";

string str3 = "World";

cout<<endl;

cout<<str2+str3;

/*eigth way by taking input but im just commenting the input interface for quick run*/

string str4="13.Hello World";

//cin>>str4;

cout<<endl<<str4;

/*ninth way using files for storing hello world in hello.txt using fprintf() and copying it in str5 and str6 using fscanf() */

FILE *fp;

char str5[10], str6[10];

fp=fopen("hello.txt","w+");

fprintf(fp,"%s %s","14.Hello","World");

rewind(fp);

fscanf(fp,"%s",str5);

fscanf(fp,"%s",str6);

fclose(fp);

cout<<endl<<str5<<" "<<str6<<endl;

/*but gotta use that stdio.h header here too for using files*/

/*tenth way using lower level system calls, this one is my personal favorate, ask if u wanna know the working coz I gotta write big comment to explain the working*/

const char str8[]= "15.Hello World";

write(STDOUT_FILENO, str8, sizeof(str8));

/* eleventh way

we can also use post/pre increment/decrement operators to move through the string or array, but should be avoided as it causes warning in many compilers and causes error in large texts*/

//post increment x++

char str10[20]={'1','6','.','H','e','l','l','o',' ','W','o','r','l','d','!'};

x=0;

cout<<endl;

while(str10[x]!='!')

{

cout<<str10[x++];

}

//pre increment ++x

char str11[20]={'1','7','.','H','e','l','l','o',' ','W','o','r','l','d'};

x=-1;

cout<<endl;

while(x<=13)

{

cout<<str11[++x];

}

//post decrement x--

char str12[20]={'d','l','r','o','W',' ','o','l','l','e','H','.','8','1'};

x=13;

cout<<endl;

while(x>=0)

{

cout<<str12[x--];

}

//pre decrement --x

char str13[20]={'d','l','r','o','W',' ','o','l','l','e','H','.','9','1'};

x=14;

cout<<endl;

while(x>=0)

{

cout<<str13[x--];

}

/* twelvth way using socket programs, working on it but stuck badly can anyone help how to implement client and server here in sololearn */

return 0;

}

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