How to write a C Program To Check The Postfix Expression Using Recursion in C Programming Language ?
#include<stdio.h>
#include <conio.h>
#include <ctype.h>
void valid();
main()
{
//clrscr();
printf("\nEnter the postfix expression: ");
valid();
getch();
}
void valid()
{
char b;
b=getche();
if (isalpha(b))
{
b=getche();
if (b=='\r')
printf("invalid expression");
else if (isalpha(b))
{
b=getche();
if (b=='+'||b=='-'||b=='*'||b=='/')
printf("valid expression");
}
else printf("invalid expression");
}
}
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