C :

#include "math.h"
int main(int argc, char* argv[])
{
	int n,a,b,c;
	  char str[2],str1[2];
	  scanf("%d",&n);
	 while(n--)
	 {
		  scanf("%s%d%s%d",str,&a,str1,&b);
	        if(str[0]=='A')
			{
			   if(str1[0]=='B')
			   {
			      c=sqrt((a*a+b*b));
				    printf("A %d B %d C %d\n",a,b,c);
			   }
			   else
			   {
			       c=sqrt((b*b-a*a));
				    printf("A %d B %d C %d\n",a,c,b);
			   }
			}
			if(str[0]=='B')
			{
			   if(str1[0]=='A')
			   {
			      c=sqrt((a*a+b*b));
				    printf("A %d B %d C %d\n",b,a,c);
			   }
			   else
			   {
			       c=sqrt((b*b-a*a));
				    printf("A %d B %d C %d\n",c,a,b);
			   }
			}
			if(str[0]=='C')
			{
			   if(str1[0]=='A')
			   {
			      c=sqrt((a*a-b*b));
				    printf("A %d B %d C %d\n",b,c,a);
			   }
			   else
			   {
			       c=sqrt((a*a-b*b));
				    printf("A %d B %d C %d\n",c,b,a);
			   }
			}
	 }
	
	return 0;
}

C++ :

#include <iostream>
#include <math.h>
#include <stdio.h>
using namespace std;
int main()
{
int T,n,m;
char a,b,c;
 cin>>T;
 while(T--)
 {
	 int x,y;
   cin>>a>>n>>b>>m;
   if(a=='C')
   {
   x=sqrt(n*n-m*m);
   if(b=='A')
	   printf("A %d B %d C %d\n",m,x,n);
   else
	   printf("A %d B %d C %d\n",x,m,n);
   }
   else if(b=='C')
   {
   x=sqrt(m*m-n*n);
   if(a=='A')
   cout<<a<<" "<<n<<" "<<"B "<<x<<" "<<b<<" "<<m<<endl;
   else
     printf("A %d B %d C %d\n",x,n,m);	 
   }
   else
   {
   x=sqrt(n*n+m*m);
   cout<<a<<" "<<n<<" "<<b<<" "<<m<<" "<<"C "<<x<<endl;
   }
 }
return 0;
}

Java :

import java.util.Scanner;


public class Main {

	public static void main(String[] args) {
		int N;
		Scanner s = new Scanner(System.in);
		
		N = s.nextInt();
		while(s.hasNext()&&N>0){
			int a = 0,b = 0,c = 0;
			String[] str = new String[4];
			for (int i = 0; i <4; i++) {
				str[i] = s.next();
			}
			
				
			for (int i = 0; i < str.length; i+=2) {
				if(str[i].equals("A")){
					a=Integer.parseInt(str[i+1]);
				}
               if(str[i].equals("B")){
            	   b=Integer.parseInt(str[i+1]);
				}
           if(str[i].equals("C")){
        	   c=Integer.parseInt(str[i+1]);
              }
			}
			if(a==0){
				a=(int) Math.sqrt(c*c-b*b);
			}
			if(b==0){
				b=(int) Math.sqrt(c*c-a*a);
			}
			if(c==0){
				c=(int) Math.sqrt(a*a+b*b);
			}
			System.out.println("A "+a+" "+"B "+b+" "+"C "+c);
			
			N--;
			
		}
	}

}