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Source Code
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#include <stdio.h>
#include <ctype.h>
#define SIZE 50
char stack[SIZE];
int top=-1; /* Global declarations */
push(char elem)
{ /* Function for PUSH operation */
stack[++top]=elem;
}
char pop()
{ /* Function for POP operation */
return(stack[top--]);
}
int pr(char symbol)
{ /* Function for precedence */
if(symbol == '^')/* exponent operator, highest precedence*/
{
return(3);
}
else if(symbol == '*' || symbol == '/')
{
return(2);
}
else if(symbol == '+' || symbol == '-') /* lowest precedence */
{
return(1);
}
else
{
return(0);
}
}
/* Main Program */
void main()
{
char infix[50],postfix[50],ch,elem;
int i=0,k=0;
printf("Enter Infix Expression : ");
scanf("%s",infix);
push('#');
while( (ch=infix[i++]) != '\0')
{
if( ch == '(') push(ch);
else
if(isalnum(ch)) postfix[k++]=ch;
else
if( ch == ')')
{
while( stack[top] != '(')
postfix[k++]=pop();
elem=pop(); /* Remove ( */
}
else
{ /* Operator */
while( pr(stack[top]) >= pr(ch) )
postfix[k++]=pop();
push(ch);
}
}
while( stack[top] != '#') /* Pop from stack till empty */
postfix[k++]=pop();
postfix[k]='\0'; /* Make postfix as valid string */
printf("\nPostfix Expression = %s\n",postfix);
}
Compiling Program...
Standard Input:
Interactive Console
Text
Program is not being debugged. Click "Debug" button to start program in debug mode.
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| Variable | Value |
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| Register | Value |
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| Expression | Value |
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| # | Description |
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