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DS/C/Lab/Week6/PrefixToPostfix.c

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+#include <stdio.h>
+#include <string.h>
+
+#define MAX_SIZE 100
+
+char stack[MAX_SIZE][MAX_SIZE];
+int top = -1;
+
+void push(const char* item) {
+    if (top >= MAX_SIZE - 1) {
+        printf("Stack Overflow\n");
+        return;
+    }
+    strcpy(stack[++top], item);
+}
+
+char* pop() {
+    if (top < 0) {
+        printf("Stack Underflow\n");
+        return NULL;
+    }
+    return stack[top--];
+}
+
+int isOperator(char c) {
+    return (c == '+' || c == '-' || c == '*' || c == '/');
+}
+
+int isAlphanumeric(char c) {
+    return ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'));
+}
+
+void prefixToPostfix(char* prefix) {
+    int len = strlen(prefix);
+    char temp[MAX_SIZE];
+    
+    for (int i = len - 1; i >= 0; i--) {
+        if (isAlphanumeric(prefix[i])) {
+            temp[0] = prefix[i];
+            temp[1] = '\0';
+            push(temp);
+        } else if (isOperator(prefix[i])) {
+            char op1[MAX_SIZE], op2[MAX_SIZE], result[MAX_SIZE];
+            strcpy(op1, pop());
+            strcpy(op2, pop());
+            sprintf(result, "%s%s%c", op1, op2, prefix[i]);
+            push(result);
+        }
+    }
+    
+    printf("Postfix expression: %s\n", stack[top]);
+}
+
+int main() {
+    char prefix[MAX_SIZE];
+    printf("Enter prefix expression: ");
+    fgets(prefix, MAX_SIZE, stdin);
+    prefix[strcspn(prefix, "\n")] = 0;  // Remove newline if present
+    
+    prefixToPostfix(prefix);
+    
+    return 0;
+}