this code is the base of lexer , and it does the basic operation of removing the whitespaces from a source file and rewrites it into another file with each word in separate lines .
But i am not able to understand why the file lext.txt not getting updated?
#include<stdio.h>
/* this is a lexer which recognizes constants , variables ,symbols, identifiers , functions , comments and also header files . It stores the lexemes in 3 different files . One file contains all the headers and the comments . Another file will contain all the variables , another will contain all the symbols. */
int main()
{
int i;
char a,b[20],c;
FILE *fp1,*fp2;
fp1=fopen("source.txt","r"); //the source file is opened in read only mode which will passed through the lexer
fp2=fopen("lext.txt","w");
//now lets remove all the white spaces and store the rest of the words in a file
if(fp1==NULL)
{
perror("failed to open source.txt");
//return EXIT_FAILURE;
}
i=0;
while(!feof(fp1))
{
a=fgetc(fp1);
if(a!="")
{
b[i]=a;
printf("hello");
}
else
{
b[i]='\0';
fprintf(fp2, "%.20s\n", b);
i=0;
continue;
}
i=i+1;
/*Switch(a)
{
case EOF :return eof;
case '+':sym=sym+1;
case '-':sym=sym+1;
case '*':sym=sym+1;
case '/':sym=sym+1;
case '%':sym=sym+1;
case '
*/
}
return 0;
}
