Prefix Evaluation

Medium Stack: Applications PRO

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Problem Statement

Write a C program to evaluate a prefix expression containing single-digit operands and operators (+, -, *, /).

Input Format

A valid prefix expression string.

Output Format

Print the evaluated integer result.

Constraints

Valid expression with integer operations

Sample Input

-+2*319

Sample Output

-4

Explanation

Traverse the prefix expression from right to left: if operand, push to stack; if operator, pop two operands, evaluate, and push result back.

Starter Code

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {
    char expr[100];
    if (scanf("%s", expr) == 1) {
        // Write your code here to evaluate prefix expression using stack
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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