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/*
* C Program to convert a given infix expression to postfix expression and evaluate it.
* (c) www.c-program-example.com
*/
#define SIZE 50 /* Size of Stack */
#include <ctype.h>
#include <stdio.h>
char s[SIZE];
int top = -1; /* Global declarations */
/* Function to remove spaces from given string */
void RemoveSpaces(char* source) {
char* i = source;
char* j = source;
while(*j != 0) {
*i = *j++;
if(*i != ' ')
i++;
}
*i = 0;
}
/* Function for PUSH operation */
void push(char elem) {
s[++top] = elem;
}
/* Function for POP operation */
char pop() {
return (s[top--]);
}
/* Function for precedence */
int pr(char elem) {
switch (elem) {
case '#':
return 0;
case '(':
return 1;
case '+':
case '-':
return 2;
case '*':
case '/':
return 3;
}
}
/*
* Function to convert from infix to postfix expression
*/
void infix_to_postfix(char *infix, char *postfix) {
char ch, elem;
int i = 0, k = 0;
RemoveSpaces(infix);
push('#');
while ((ch = infix[i++]) != '\n') {
if (ch == '(')
push(ch);
else if (isalnum(ch))
postfix[k++] = ch;
else if (ch == ')') {
while (s[top] != '(')
postfix[k++] = pop();
elem = pop(); /* Remove ( */
} else { /* Operator */
while (pr(s[top]) >= pr(ch))
postfix[k++] = pop();
push(ch);
}
}
while (s[top] != '#') /* Pop from stack till empty */
postfix[k++] = pop();
postfix[k] = 0; /* Make postfix as valid string */
}
/*
* Function to evaluate a postfix expression
*/
int eval_postfix(char *postfix) {
char ch;
int i = 0, op1, op2;
while((ch = postfix[i++]) != 0) {
if(isdigit(ch))
push(ch-'0'); /* Push the operand */
else { /* Operator,pop two operands */
op2 = pop();
op1 = pop();
switch(ch) {
case '+' : push(op1+op2);
break;
case '-' : push(op1-op2);
break;
case '*' : push(op1*op2);
break;
case '/' : push(op1/op2);
break;
}
}
}
return s[top];
}
void main() { /* Main Program */
char infx[50], pofx[50];
printf("\nInput the infix expression: ");
fgets(infx, 50, stdin);
infix_to_postfix(infx, pofx);
printf("\nGiven Infix Expression: %sPostfix Expression: %s", infx, pofx);
top = -1;
printf("\nResult of evaluation of postfix expression : %d", eval_postfix(pofx));
}
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