56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
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#include <stdio.h>
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#include <string.h>
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#define MAX_SIZE 100
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#define MAX_EXPR_LEN 200
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char stack[MAX_SIZE][MAX_EXPR_LEN];
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int top = -1;
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void push(const char* item) {
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if (top >= MAX_SIZE - 1) {
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printf("Stack Overflow\n");
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return;
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}
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strcpy(stack[++top], item);
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}
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char* pop() {
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if (top < 0) {
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printf("Stack Underflow\n");
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return NULL;
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}
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return stack[top--];
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}
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int isOperator(char c) {
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return (c == '+' || c == '-' || c == '*' || c == '/' || c == '^');
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}
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void postfixToInfix(const char* postfix) {
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char op1[MAX_EXPR_LEN], op2[MAX_EXPR_LEN], temp[MAX_EXPR_LEN];
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for (int i = 0; postfix[i] != '\0'; i++) {
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if (!isOperator(postfix[i])) {
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temp[0] = postfix[i];
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temp[1] = '\0';
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push(temp);
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} else {
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strcpy(op2, pop());
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strcpy(op1, pop());
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sprintf(temp, "(%s%c%s)", op1, postfix[i], op2);
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push(temp);
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}
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}
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printf("Infix expression: %s\n", stack[top]);
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}
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int main() {
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char postfix[MAX_SIZE];
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printf("Enter postfix expression: ");
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gets(postfix);
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postfixToInfix(postfix);
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return 0;
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}
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