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How to use switch statement,What problom of my below code

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switch(x)
            {
               case 1: 
                  if(USD==1) firstcurrent=1; if(USD==2)  firstcurrent=2;
               case 2: 
                  if(EUR==1) firstcurrent=1; if(EUR==2)  firstcurrent=2;
               case 3: 
                  if(GBP==1) firstcurrent=1; if(GBP==2)  firstcurrent=2;
               case 4: 
                  if(CHF==1) firstcurrent=1; if(CHF==2)  firstcurrent=2;
               case 5: 
                  if(JPY==1) firstcurrent=1; if(JPY==2)  firstcurrent=2;
               case 6: 
                  if(AUD==1) firstcurrent=1; if(AUD==2)  firstcurrent=2; 
               case 7: 
                  if(CAD==1) firstcurrent=1; if(CAD==2)  firstcurrent=2;   
               case 8: 
                  if(NZD==1) firstcurrent=1; if(NZD==2)  firstcurrent=2;              
            }
          switch(y)
            {
               case 1: 
                  if(USD==1) secondcurrent=1; if(USD==2)  secondcurrent=2;
               case 2: 
                  if(EUR==1) secondcurrent=1; if(EUR==2)  secondcurrent=2;
               case 3: 
                  if(GBP==1) secondcurrent=1; if(GBP==2)  secondcurrent=2;
               case 4: 
                  if(CHF==1) secondcurrent=1; if(CHF==2)  secondcurrent=2;
               case 5: 
                  if(JPY==1) secondcurrent=1; if(JPY==2)  secondcurrent=2;
               case 6: 
                  if(AUD==1) secondcurrent=1; if(AUD==2)  secondcurrent=2; 
               case 7: 
                  if(CAD==1) secondcurrent=1; if(CAD==2)  secondcurrent=2;   
               case 8: 
                  if(NZD==1) secondcurrent=1; if(NZD==2)  secondcurrent=2;              
            }
You need to add "break;". See switch documentation.
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