post fix expression

Infix Postfix Prefix Notes A * B + C / D A B * C D / + + * A B / C D multiply A and B, divide C by D, add the results A * (B + C) / D A B C + * D / / * A + B C D add B and C, multiply by A, divide by D A * (B + C / D) A B C D / + * * A + B / C D divide C by D, add B, multiply by A