cin vs getchar()

[rpsalh]

i was trying to make a program it worked good with cin but not with getchar please tell.

/*Program to read a character and display its next character in the ASCII list*/
#include<iostream>
#include<stdlib.h>
#include<stdio.h>
using namespace std;
int main()
{
    char ch,Next,ch1;
    do
    {
        cout<<"\nEnter any character : ";
        ch=getchar();
        Next=ch+1;
        cout<<"\nThe next character is : ";
        putchar(Next);
        cout<<"\nWant to enter more(y/n)";
        ch1=getchar();
    }
    while(ch1=='y'||ch1=='Y');
    cout<<"\n";
    system("pause");
    return 0;

The above program instead of taking the value of ch1 terminates the loop itself .While the following program with cin works fine.

/*Program to read a character and display its next character in the ASCII list*/
#include<iostream>
#include<stdlib.h>
#include<stdio.h>
using namespace std;
int main()
{
    char ch,Next,ch1;
    do
    {
        cout<<"\nEnter any character : ";
        cin>>ch;
        Next=ch+1;
        cout<<"\nThe next character is : ";
        putchar(Next);
        cout<<"\nWant to enter more(y/n)";
        cin>>ch1;
    }
    while(ch1=='y'||ch1=='Y');
    cout<<"\n";
    system("pause");
    return 0;
}

[Yanson]

std::cin skips white space getchar does not.

/*Program to read a character and display its next character in the ASCII list*/
#include<iostream>
#include<stdlib.h>
#include<stdio.h>
using namespace std;
int main()
{
    char ch,Next,ch1;
    do
    {
        cout<<"\nEnter any character : ";
        ch=getchar();
        std::cin.ignore();
        Next=ch+1;
        cout<<"\nThe next character is : ";
        putchar(Next);
        cout<<"\nWant to enter more(y/n)";
        ch1=getchar();
        std::cin.ignore();
    }
    while(ch1=='y'||ch1=='Y');
    cout<<"\n";
    system("pause");
    return 0;
}

[Duthomhas]

By default, cin ignores all whitespace. getchar() does not, so the prompt asking for 'y' or 'n' is actually reading a newline '\n', which fails the loop condition.

Hope this helps.

[rpsalh]

the program given by

Yansoon

works as i want the program to so std::cin.ignore() is for ignoring a blank space or ignoring everything irrelevent?
And yes, thanks to both of you

[Duthomhas]

cin.ignore();

is identical to

getchar(); (notice: no assignment to a variable!)

[rpsalh]

thanks got it