Thread: Program Runs off Screen / Lexical Analyzer

Can anyone tell me why my program: once it is executed, runs down the screen and it doesnt let me scroll up!!! no idea why its doing this. very frustrating. i tried changing with my properties on my console window...but nothing. maybe it is the code.

here is my code: it is 2 files

cLex.c

Code:

#include<stdio.h>
#include<ctype.h>
#include<string.h>

void keyw(char *p);

int i=0,id=0,kw=0,num=0,op=0;

char keys[32][10]={"auto","break","case","char","const","continue","default",
"do","double","else","enum","extern","float","for","goto",
"if","int","long","register","return","short","signed",
"sizeof","static","struct","switch","typedef","union",
"unsigned","void","volatile","while"};

main()
    {
    	char ch,str[25],seps[15]=" \t\n,;(){}[]#\"<>",oper[]="!%^&*-+=~|.<>/?";
    	int j;
    	char fname[50];
    	FILE *f1;
    	//clrscr();
    printf("enter file path (drive:\\fold\\filename)\n");
    scanf("%s",fname);
    f1 = fopen(fname,"r");
    //f1 = fopen("Input","r");
    	if(f1==NULL)


        	{
        	 printf("file not found");
        	 exit(0);
        	}
        	while((ch=fgetc(f1))!=EOF)


            	{
            for(j=0;j<=14;j++)


                {
                if(ch==oper[j])


                    {
                    printf("%c is an operator\n",ch);
                    op++;
                    str[i]='\0';
                    keyw(str);
                }

            }

            for(j=0;j<=14;j++)


                {
                if(i==-1)
                break;
                if(ch==seps[j])


                    {
                    if(ch=='#')


                        {
                        while(ch!='>')


                            {
                            printf("%c",ch);
                            ch=fgetc(f1);
                        }

                        printf("%c is a header file\n",ch);
                        i=-1;
                        break;
                    }

                    if(ch=='"')


                        {
                        do


                            {
                            ch=fgetc(f1);
                            printf("%c",ch);
                        }while(ch!='"');

                        printf("\b is an argument\n");
                        i=-1;
                        break;
                    }

                    str[i]='\0';
                    keyw(str);
                }

            }

            if(i!=-1)


                {
                str[i]=ch;
                i++;
            }

            else
            i=0;
            	}
            printf("Keywords: %d\nIdentifiers: %d\nOperators: %d\nNumbers: %d\n",kw,id,op,num);
            //getch();
        }

        void keyw(char *p)


            {
            int k,flag=0;
            for(k=0;k<=31;k++)


                {
                if(strcmp(keys[k],p)==0)


                    {
                    printf("%s is a keyword\n",p);
                    kw++;
                    flag=1;
                    break;
                }

            }

            if(flag==0)


                {
                if(isdigit(p[0]))


                    {
                    printf("%s is a number\n",p);
                    num++;
                }

                else


                    {
                    //if(p[0]!=13&&p[0]!=10)
                    if(p[0]!='\0')


                        {
                        printf("%s is an identifier\n",p);
                        id++;
                    }

                }

            }

            i=-1;
        }

Set a flag when you're in a comment read, and read until you get a matching */.


Quzah.

If I had a program that ran off the screen, I would attach some kind of leash to it, linked to a gearing mechanism and generator, and use it to produce power.

Why is this so confusing for you? Do something like:

Code:

while( fgets( buf, BUFSIZ, inputfile ) != NULL )
{
    switch( flags )
    {
        case SOMEFLAG:
            ...look at the string to see if it's what I need...
            ...do something with it if it is...
            ...handle errors if it isn't...
        break;

        case ANOTHERFLAG:
            ...more of the same...
    }
}

You check for a #define the same way you check for anything else.


Quzah.