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Author: Prati5

identifiersKeywords.l

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+/* Lex program to print whether the entered word is keyword or identifiers.
+// Lex program includes  three sections :
+// 1. definition section; which includes C header files and intialisation and declarition of variables.
+// 2. Rule Section; includes the description of the tokens using regular language written in UNIX style. It consists of pattern and action. Action is enclosed in curly braces{}. 
+// 3. User subroutine Section which includes normal C program statements and calling statements to action part of section two. yylex() initialises the Lexer.
+ */
+
+%{
+#include<stdio.h>
+int key_Count=0, id_count=0;
+%}
+%%
+const |
+final |
+break |
+else  |
+while |
+for   |
+if    |
+do    |
+switch               {     printf(" %s is a keyword\n",yytext);
+			   return(0); }
+[a-zA-Z]+[a-zA-Z0-9]* {     printf(" %s is a identifier\n",yytext);
+			   return(0); }
+%%
+int main(){
+	printf("Enter a cahracter/word. \n");
+	yylex();
+} 

outputScreenShot.xcf

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+// progarm to check whether the given sentence is compound or simple. 
+/*// Lex program includes  three sections :
+// 1. definition section; which includes C header files and intialisation and declarition of variables.
+// 2. Rule Section; includes the description of the tokens using regular language written in UNIX style. It consists of pattern and action. Action is enclosed in curly braces{}. 
+// 3. User subroutine Section which includes normal C program statements and calling statements to action part of section two. yylex() initialises the Lexer.
+// v_count is used hold the count of vowels and c_count is used to hold the count of consonant.
+*/
+%{
+#include<stdio.h>
+int flag=0;
+%}
+%%
+(""[nN][oO][rR]"")|(""[aA][nN][dD]"")|(""[oO][rR]"")|(""[sS][oO]"")|(""[bB][uU][tT]"") { printf("The compound word used  is %s",yytext); flag=1;}
+%%
+int main()
+{
+	printf("Enter the sentence\n");
+	yylex();
+	if(flag==1) 
+		printf("\nCompound sentence\n");
+	else 
+		printf("\nSimple sentence\n");
+	return 0;
+}

readmeLex.odt

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+/* Program to count number of vowels and consonant in the entered string.
+// Lex program includes  three sections :
+// 1. definition section; which includes C header files and intialisation and declarition of variables.
+// 2. Rule Section; includes the description of the tokens using regular language written in UNIX style. It consists of pattern and action. Action is enclosed in curly braces{}. 
+// 3. User subroutine Section which includes normal C program statements and calling statements to action part of section two. yylex() initialises the Lexer.
+// v_count is used hold the count of vowels and c_count is used to hold the count of consonant.
+*/
+%{
+#include<stdio.h>
+int v_count=0, c_count=0;
+%}
+
+%%
+[ \t\n] {;}
+[aAeEiIoOuU] { v_count++; }
+[a-zA-Z] {c_count++;  }
+%%
+
+int main(){
+	printf("Enter a sentence \n");
+	yylex();
+	printf("The number of vowels =%d \n",v_count);
+	printf("The number of consonants=%d \n", c_count);
+}