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This commit is contained in:
Aadit Agrawal 2024-09-03 11:27:09 +05:30
parent 44cced8454
commit 5b8ed261ff
3 changed files with 96 additions and 56 deletions
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75
DS/C/Lab/Week5/PostfixCheck.c
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@ -6,61 +6,80 @@
int stack[MAX_SIZE];
int top = -1;
void push(int item) {
if (top >= MAX_SIZE - 1) {
void push(int item)
{
if (top >= MAX_SIZE - 1)
{
printf("Stack Overflow\n");
return;
}
stack[++top] = item;
}
int pop() {
if (top < 0) {
int pop()
{
if (top < 0)
{
printf("Stack Underflow\n");
return -1; // Return a sentinel value instead of exiting
return -1;
}
return stack[top--];
}
int isDigit(char c) {
int isDigit(char c)
{
return c >= '0' && c <= '9';
}
int evaluatePostfix(char* exp) {
int evaluatePostfix(char *exp)
{
int i, operand1, operand2, result;
for (i = 0; exp[i] != '\0'; i++) {
if (isDigit(exp[i])) {
for (i = 0; exp[i] != '\0'; i++)
{
if (isDigit(exp[i]))
{
push(exp[i] - '0');
} else {
}
else
{
operand2 = pop();
operand1 = pop();
switch (exp[i]) {
case '+': push(operand1 + operand2); break;
case '-': push(operand1 - operand2); break;
case '*': push(operand1 * operand2); break;
case '/':
if (operand2 == 0) {
printf("Error: Division by zero\n");
return -1; // Return a sentinel value instead of exiting
}
push(operand1 / operand2);
break;
switch (exp[i])
{
case '+':
push(operand1 + operand2);
break;
case '-':
push(operand1 - operand2);
break;
case '*':
push(operand1 * operand2);
break;
case '/':
if (operand2 == 0)
{
printf("Error: Division by zero\n");
return -1;
}
push(operand1 / operand2);
break;
}
}
}
return pop();
}
int main() {
int main()
{
char exp[MAX_SIZE];
printf("Enter a postfix expression: ");
fgets(exp, MAX_SIZE, stdin);
exp[strcspn(exp, "\n")] = 0; // Remove newline if present
gets(exp);
int result = evaluatePostfix(exp);
if (result != -1) {
if (result != -1)
{
printf("Result: %d\n", result);
}
return 0;
}
}