Created
September 4, 2018 19:54
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| #include <stdio.h> | |
| #include <string.h> | |
| char s[100]; | |
| int top; | |
| void Init() | |
| { | |
| top = -1; | |
| } | |
| int Full() | |
| { | |
| if(top==100) return 1; | |
| return 0; | |
| } | |
| int Empty() | |
| { | |
| if(top==-1) return 1; | |
| return 0; | |
| } | |
| void Push(char c) | |
| { | |
| if(Full()==0) s[++top] = c; | |
| } | |
| char Pop() | |
| { | |
| if(Empty()==0) return s[top--]; | |
| } | |
| int Priority(char c) | |
| { | |
| if(c=='*'||c=='/') return 2; | |
| return 1; | |
| } | |
| void main() | |
| { | |
| char string[100],c; | |
| printf("Enter the expression :: "); | |
| scanf(" %[^\n]",string); | |
| char postfix[100]; | |
| int j=0; | |
| Init(); | |
| for(int i=0;i<strlen(string);i++) | |
| { | |
| if(string[i] >= '0' && string[i] <= '9') postfix[j++] = string[i]; | |
| else if(string[i]=='(') Push(string[i]); | |
| else if(string[i]==')') | |
| { | |
| while(s[top]!='(') postfix[j++] = Pop(); | |
| Pop(); | |
| } | |
| else | |
| { | |
| if(Empty()==1) | |
| { | |
| Push(string[i]); | |
| } | |
| else | |
| { | |
| while(Priority(string[i])<Priority(s[top])) | |
| postfix[j++] = Pop(); | |
| Push(string[i]); | |
| } | |
| } | |
| } | |
| while(Empty()==0) postfix[j++] = Pop(); | |
| printf("Postfix expression: "); | |
| for(int i=0;i<j;i++) printf("%c",postfix[i]); | |
| } |
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