C :

#include<stdio.h>
#include<string.h>
int main(void)
{

    int n;
    scanf("%d",&n);
    while(n--)
    {
        int i;
        char s[1005];
        scanf("%s",s);
        for(i=0;i<strlen(s);i++)
        {
            if(s[i]=='Q') s[i]='W';
            else if(s[i]=='W') s[i]='E';
            else if(s[i]=='E') s[i]='R';
            else if(s[i]=='R') s[i]='T';
            else if(s[i]=='T') s[i]='Y';
            else if(s[i]=='Y') s[i]='U';
            else if(s[i]=='U') s[i]='I';
            else if(s[i]=='I') s[i]='O';
            else if(s[i]=='O') s[i]='P';
            else if(s[i]=='P') s[i]='Q';
            else if(s[i]=='A') s[i]='S';
            else if(s[i]=='S') s[i]='D';
            else if(s[i]=='D') s[i]='F';
            else if(s[i]=='F') s[i]='G';
            else if(s[i]=='G') s[i]='H';
            else if(s[i]=='H') s[i]='J';
            else if(s[i]=='J') s[i]='K';
            else if(s[i]=='K') s[i]='L';
            else if(s[i]=='L') s[i]='A';
            else if(s[i]=='Z') s[i]='X';
            else if(s[i]=='X') s[i]='C';
            else if(s[i]=='C') s[i]='V';
            else if(s[i]=='V') s[i]='B';
            else if(s[i]=='B') s[i]='N';
            else if(s[i]=='N') s[i]='M';
            else if(s[i]=='M') s[i]='Z';
            else if(s[i]=='q') s[i]='w';
            else if(s[i]=='w') s[i]='e';
            else if(s[i]=='e') s[i]='r';
            else if(s[i]=='r') s[i]='t';
            else if(s[i]=='t') s[i]='y';
            else if(s[i]=='y') s[i]='u';
            else if(s[i]=='u') s[i]='i';
            else if(s[i]=='i') s[i]='o';
            else if(s[i]=='o') s[i]='p';
            else if(s[i]=='p') s[i]='q';
            else if(s[i]=='a') s[i]='s';
            else if(s[i]=='s') s[i]='d';
            else if(s[i]=='d') s[i]='f';
            else if(s[i]=='f') s[i]='g';
            else if(s[i]=='g') s[i]='h';
            else if(s[i]=='h') s[i]='j';
            else if(s[i]=='j') s[i]='k';
            else if(s[i]=='k') s[i]='l';
            else if(s[i]=='l') s[i]='a';
            else if(s[i]=='z') s[i]='x';
            else if(s[i]=='x') s[i]='c';
            else if(s[i]=='c') s[i]='v';
            else if(s[i]=='v') s[i]='b';
            else if(s[i]=='b') s[i]='n';
            else if(s[i]=='n') s[i]='m';
            else if(s[i]=='m') s[i]='z';

        }
        printf("%s\n",s);
    }
    return 0;
}

C++ :

#include <fstream>
#include <iostream>
using namespace std;

string bef="qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
string tra="wertyuiopqsdfghjklaxcvbnmzWERTYUIOPQSDFGHJKLAXCVBNMZ";

int main()
{
//	ofstream cout;
//	ifstream cin;
//	cin.open("A_ALL.in");
//	cout.open("A_ALL.out");
	int testcase;
	cin>>testcase;
	while(testcase--)
	{
		string tar,end;
		cin>>tar;
		for(int i=0;i<tar.length();i++)
		{
			for(int j=0;j<bef.length();j++)
			{
				if(bef[j]==tar[i])
					end+=tra[j];
			}
		}
		cout<<end<<endl;
	}
	
	return 0;
}

Java :

import java.util.Scanner;
class Main {
	public static void main(String[] args) {
		Scanner reader=new Scanner(System.in);
		char[] first={'q','w','e','r','t','y','u','i','o','p','a','s','d','f','g','h','j','k','l','z','x','c','v','b','n','m',
				'Q','W','E','R','T','Y','U','I','O','P','A','S','D','F','G','H','J','K','L','Z','X','C','V','B','N','M'};
		char[] second={'w','e','r','t','y','u','i','o','p','q','s','d','f','g','h','j','k','l','a','x','c','v','b','n','m','z',
				'W','E','R','T','Y','U','I','O','P','Q','S','D','F','G','H','J','K','L','A','X','C','V','B','N','M','Z'};
		int T=reader.nextInt();
		for(int i=0;i<T;i++){
			String str=reader.next();
			char[] ch=str.toCharArray();
			for(int j=0;j<ch.length;j++){
				for(int k=0;k<first.length;k++){
					if(ch[j]==first[k]){
						System.out.print(second[k]);
					}
				}
			}
          System.out.println();
		}
	}
}