#include<stdio.h>
#include<ctype.h>
char stack[100];
int top = -1;
void push(char x)
{
stack[++top] = x;
}
char pop()
{
if(top == -1)
return -1;
else
return stack[top--];
}
int priority(char x)
{
if(x == '(' || x== '{' || x == '[')
return 0;
if(x == '+' || x == '-')
return 1;
if(x == '*' || x == '/')
return 2;
return 0;
}
int main()
{
char exp[100];
char *e, x;
printf("Enter the expression : ");
scanf("%s",exp);
printf("\n");
e = exp;
while(*e != '\0')
{
if(isalnum(*e))
printf("%c ",*e);
else if(*e == '(' || *e == '{' || *e == '[')
push(*e);
else if(*e == ')')
{
while((x = pop()) != '(')
printf("%c ", x);
}
else if(*e == '}')
{
while((x = pop()) != '{')
printf("%c ", x);
}
else if(*e == ']')
{
while((x = pop()) != '[')
printf("%c ", x);
}
else
{
while(priority(stack[top]) >= priority(*e))
printf("%c ",pop());
push(*e);
}
e++;
}
while(top != -1)
{
printf("%c ",pop());
}return 0;
}