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Aadit Agrawal 2024-09-03 00:27:03 +05:30
parent 0cdc830d54
commit c6df50662d
4 changed files with 287 additions and 0 deletions
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91
DS/C/Lab/Week6/InfixToPrefix.c Normal file
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#include <stdio.h>
#include <string.h>
#define MAX_SIZE 100
char stack[MAX_SIZE];
int top = -1;
void push(char item) {
if (top >= MAX_SIZE - 1) {
printf("Stack Overflow\n");
return;
}
stack[++top] = item;
}
char pop() {
if (top < 0) {
printf("Stack Underflow\n");
return -1;
}
return stack[top--];
}
int precedence(char symbol) {
switch (symbol) {
case '^': return 3;
case '*':
case '/': return 2;
case '+':
case '-': return 1;
default: return 0;
}
}
void reverse(char *str) {
int len = strlen(str);
int i, j;
char temp;
for (i = 0, j = len - 1; i < j; i++, j--) {
temp = str[i];
str[i] = str[j];
str[j] = temp;
}
}
int isalnum(char c) {
return ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'));
}
void infixToPrefix(char infix[], char prefix[]) {
char symbol, temp[2];
int i, j = 0;
reverse(infix);
for (i = 0; infix[i] != '\0'; i++) {
symbol = infix[i];
if (isalnum(symbol)) {
prefix[j++] = symbol;
} else if (symbol == ')') {
push(symbol);
} else if (symbol == '(') {
while ((temp[0] = pop()) != ')') {
prefix[j++] = temp[0];
}
} else {
while (top > -1 && precedence(stack[top]) > precedence(symbol)) {
prefix[j++] = pop();
}
push(symbol);
}
}
while (top > -1) {
prefix[j++] = pop();
}
prefix[j] = '\0';
reverse(prefix);
}
int main() {
char infix[MAX_SIZE], prefix[MAX_SIZE];
printf("Enter infix expression: ");
fgets(infix, MAX_SIZE, stdin);
infix[strcspn(infix, "\n")] = 0; // Remove newline if present
infixToPrefix(infix, prefix);
printf("Prefix expression: %s\n", prefix);
return 0;
}

70
DS/C/Lab/Week6/PrefixCheck.c Normal file
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#include <stdio.h>
#include <string.h>
#define MAX_SIZE 100
int stack[MAX_SIZE];
int top = -1;
void push(int item) {
if (top >= MAX_SIZE - 1) {
printf("Stack Overflow\n");
return;
}
stack[++top] = item;
}
int pop() {
if (top < 0) {
printf("Stack Underflow\n");
return -1;
}
return stack[top--];
}
int isOperator(char c) {
return (c == '+' || c == '-' || c == '*' || c == '/');
}
int isDigit(char c) {
return (c >= '0' && c <= '9');
}
int evaluatePrefix(char* expr) {
int len = strlen(expr);
for (int i = len - 1; i >= 0; i--) {
if (isDigit(expr[i])) {
push(expr[i] - '0');
} else if (isOperator(expr[i])) {
int operand1 = pop();
int operand2 = pop();
switch (expr[i]) {
case '+': push(operand1 + operand2); break;
case '-': push(operand1 - operand2); break;
case '*': push(operand1 * operand2); break;
case '/':
if (operand2 != 0) push(operand1 / operand2);
else {
printf("Error: Division by zero\n");
return -1;
}
break;
}
}
}
return pop();
}
int main() {
char expr[MAX_SIZE];
printf("Enter prefix expression: ");
fgets(expr, MAX_SIZE, stdin);
expr[strcspn(expr, "\n")] = 0; // Remove newline if present
int result = evaluatePrefix(expr);
if (result != -1) {
printf("Result: %d\n", result);
}
return 0;
}

63
DS/C/Lab/Week6/PrefixToInfix.c Normal file
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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 prefixToInfix(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%c%s)", op1, prefix[i], op2);
push(result);
}
}
printf("Infix 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
prefixToInfix(prefix);
return 0;
}

63
DS/C/Lab/Week6/PrefixToPostfix.c Normal file
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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;
}