void main(){if((S0==0)&(S1!=0)&(S2!=0)) function_SE();else if ((S0!=0)&(S1==0)&(S2!=0)) function_SR();else if ((S0!=0)&(S1!=0)&(S2==0)) function_ST();}void function_SE(){}void function_SR(){}void function_ST(){}