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