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Thx ~~~ I really forgot to handle the newline char.
Problem solved ~~ Thx for your help.

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string>
using namespace std;
int main()
{

char c;
int num=0;
string s[4];
s[0] = "`1234567890-=";
s[1] = "QWERTYUIOP[]\\";
s[2] = "ASDFGHJKL;'";
s[3] = "ZXCVBNM,./";

while(cin.get(c))
{
if (c == EOF) break;
if (c ...