//Downloaded From theonlinetutorials.com
#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<ctype.h>
void main()
 {
 int i,j,k=0,count,inc=0,n;
 char name[30],open[30],ch,chh,o[30];
 char op[20]={'=','+','-','*','/','%','^','&','|'};
 clrscr();
 textcolor(3);
 cprintf("--Syntax Analyser--");
 printf("\n");
 printf("\n Enter Syntax");
 printf("\n");
 scanf("%s",name);
 n=strlen(name);
 for(i=0;i<n;i++)
 {
 ch=tolower(name[i]);
 for(j=0;j<9;j++)
 {
 if(ch==op[j])
 {
 open[k]=i;
 o[k]=ch;
 k++;
 }
 }
 }
 for(i=0;i<k;i++)
 {
 count=open[i];
 ch=tolower(name[count-1]);
 chh=tolower(name[count+1]);
 if(isalpha(ch)&&isalpha(chh)||isdigit(chh))
 ++inc;
 }
 if(k==inc)
 printf("\n %s is a valid syntax",name);
 else
 printf("\n %s is an invalid syntax",name);
 getch();
}

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Tagged as: C program for Syntax Analyzer, Syntax Analyzer, Syntax Analyzer in c