Yacc Program To Convert Infix To Postfix Expression
| #include<stdio.h> |
| #include<stdlib.h> |
| #include<ctype.h> |
| #defineSIZE30 |
| voidpush(char); |
| charpop(); |
| intpreced(char); |
| char stack[SIZE], postfix[SIZE], infix[SIZE]; |
| int top = -1; |
| intmain() |
| { |
| char ch; |
| int i, k, p = 0; |
| for(i=0; i<SIZE; i++) |
| { |
| stack[i] = '0'; |
| } |
| printf('nEnter an infix expression: '); |
| scanf('%s',infix); |
| for(i=0; infix[i] != '0'; i++) |
| { |
| ch = infix[i]; |
| if (isalnum(ch)) |
| { |
| postfix[p++] = ch; |
| } |
| elseif (ch '(') |
| { |
| push(ch); |
| } |
| elseif (ch ')') |
| { |
| while(stack[top] != '(') |
| { |
| postfix[p++] = pop(); |
| } |
| pop(); |
| } |
| elseif (ch '/' ch '*' ch '+' ch '-') |
| { |
| if (preced(ch) > preced(stack[top])) |
| { |
| push(ch); |
| } |
| else |
| { |
| while (preced(ch) <= preced(stack[top])) |
| { |
| postfix[p++] = pop(); |
| } |
| } |
| } |
| } |
| postfix[p] = '0'; |
| while(top > -1) |
| postfix[p++] = pop(); |
| printf('nThe postfix expression is: %sn',postfix); |
| return0; |
| } |
| voidpush(char el) |
| { |
| if (top < SIZE-1) |
| { |
| stack[++top] = el; |
| } |
| else |
| { |
| printf('nError! Stack is full.n'); |
| exit(-1); |
| } |
| } |
| charpop() |
| { |
| char ch; |
| if (top > -1) |
| { |
| ch = stack[top]; |
| stack[top--] = '0'; |
| return ch; |
| } |
| else |
| { |
| printf('nError! Stack is empty.n'); |
| exit(-1); |
| } |
| } |
| intpreced(char ch) |
| { |
| if(ch '(' ch ')') |
| return0; |
| elseif (ch '+' ch '-') |
| return1; |
| elseif (ch '/' ch '*') |
| return2; |
| } |
commented Aug 7, 2018
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Serial keygens cracks. I have been trying to convert an infix expression to postfix expression using YACC(Bison) with no success. I would like to know how it can be done? Sample code will be awesome:).