... a,b,c,d,k,i=0;printf("BANG CHUYEN MA BCD 7421 => BCD 2421");printf("\n\n\n");printf(" \n");printf("| STP | BCD7 421 | ==> | BCD2 421 | \n");printf(" ... a,b,c,d,k,i=0;printf("BANG CHUYEN MA BCD 7421 => BCD 2421");printf("\n\n\n");printf(" \n");printf("| STP | BCD7 421 | ==> | BCD2 421 | \n");printf(" ... a,b,c,d,k,i=0;printf("BANG CHUYEN MA BCD 7421 => BCD 2421");printf("\n\n\n");printf(" \n");printf("| STP | BCD7 421 | ==> | BCD2 421 | \n");printf("...