create link list.c

#include <stdio.h>
#include <conio.h>
#include <ctype.h>
#define MAX 100
float st[MAX];
int top=–1;
void push(float st[], float val);
float pop(float st[]);
float evaluatePostfixExp(char exp[]);
int main()
{
	float val;
	char exp[100];
	printf("\n Enter any postfix expression : ");
	gets(exp);
	val = evaluatePostfixExp(exp);
	printf("\n Value of the postfix expression = %.2f", val);
	getch();
	return 0;
}
float evaluatePostfixExp(char exp[])
{
	int i=0;
	float op1, op2, value;
	while(exp[i] != '\0')
	{
		if(isdigit(exp[i]))
		push(st, (float)(exp[i]–'0'));
		else
		{
			op2 = pop(st);
			op1 = pop(st);
			switch(exp[i])
			{
				case '+':
				value = op1 + op2;
				break;
				case '–':
				value = op1 – op2;
				break;
				case '/':
				value = op1 / op2;
				break;
				case '*':
				value = op1 * op2;
				break;
				case '%':
				value = (int)op1 % (int)op2;
				break;
			}
			push(st, value);
		}
		i++;
	}
	return(pop(st));
}
void push(float st[], float val)
{
	if(top==MAX–1)
	printf("\n STACK OVERFLOW");
	else
	{
		top++;
		st[top]=val;
	}
}	
float pop(float st[])
{
	float val=–1;
	if(top==–1)
	printf("\n STACK UNDERFLOW");
	else
	{
		val=st[top];
		top––;
	}
return val;
}