Lex program for Decimal to Hexadecimal Conversion
Problem: Write a Lex program for Decimal to Hexadecimal conversion.
Explanation:
Lex reads an input stream specifying the lexical analyzer and outputs source code implementing the lexer in the C programming language. The function yylex() is the main flex function which runs the Rule Section.
Prerequisite: Flex (Fast lexical Analyzer Generator)
Examples:
Input: 12 Output: C Input: 116 Output: 74 Input: 55 Output: 37 Input: 212 Output: D4
Implementation:
/* Lex program for decimal to hexadecimal conversion */ %{ /* Definition section */ #include<stdio.h> int num, r, digit=0, count, pcount=0, i; char a[20]; %} DIGIT [0-9] /* Rule Section */%% {DIGIT}+ { num=atoi(yytext); while(num!=0) { r=num%16; digit='0'+r; if(digit>'9') digit+=7; a[count++]=digit; num=num/16; } for(i=count-1;i>=pcount;--i) printf("%c", a[i]); pcount=count; } .|\n ECHO; %% // driver code int main() { yylex(); return 0; } |
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Output:
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