C++ program use of getchar and putchar function

Question

What is difference between these two programs

1 )

#include<iostream.h>

#include<stdlib.h>

int main()

{

system("cls");

char ch ;

do

{

cout<<"enter a character :";

ch= getchar();

if ( ch== '\n')

ch = getchar();

cout<<endl;

if (ch>= 65 && ch<= 90)

ch = ch + 32;

else

if(ch>=97 && ch<= 122)

ch = ch -32;

putchar(ch);

cout<<endl;

} while ( ch!='0');

return 0 ;

}

2 )

#include<iostream.h>

#include<stdlib.h>

int main()

{

system("cls");

char ch ;

do

{

cout<<"enter a character :";

ch= getchar();

if (ch>= 65 && ch<= 90)

ch = ch + 32;

else

if(ch>=97 && ch<= 122)

ch = ch -32;

putchar(ch);

cout<<endl;

} while ( ch!='0');

return 0 ;

}

And why we are using this line in middle of program .

if ( ch== '\n')

ch = getchar();

cout<endl;

Answer 1

Well, just taking a quick glance at this - looks like both versions will echo characters you input, but version 1 will trap new lines. It will put one out when found so that your output continues on the next line until another one is found. Version 2 looks like it will simply ignore new lines.