Mark A. Holmes

CSE 5700, Spring 2023

Lab 2

March 16. 2023

 

 

#include<string.h>

#include<ctype.h>

#include<stdio.h>

void

keyword (char str[10])

{

  if (strcmp ("for", str) == 0 || strcmp ("while", str) == 0

      || strcmp ("do", str) == 0 || strcmp ("int", str) == 0

      || strcmp ("float", str) == 0 || strcmp ("char", str) == 0

      || strcmp ("double", str) == 0 || strcmp ("static", str) == 0

      || strcmp ("switch", str) == 0 || strcmp ("case", str) == 0

      || strcmp ("mathop", str) == 0)

    printf ("\n%s is a keyword", str);

  printf ("\n%s is an identifier", str);

  printf ("\n%s is a mathematical operator", str);

 

}

 

int

main ()

{

  FILE *f1, *f2, *f3, *f4;

  char c, str[10];

  int num[100], lineno = 0, tokenvalue = 0, i = 0, j = 0, k = 0;

  printf ("\n Enter the input in the program. Input at least 4 lines by pressing Enter at the end of each line. When done, press CTRL+D: ");              /*gets(st1); */

  f1 = fopen ("input", "w");

  while ((c = getchar ()) != EOF)

    putc (c, f1);

  fclose (f1);

  f1 = fopen ("input", "r");

  f2 = fopen ("identifier", "w");

  f3 = fopen ("specialchar", "w");

  f4 = fopen ("mathop","w");

while((c=getc(f1))!=EOF)

{

if(isdigit(c))

{

tokenvalue=c-'0';

c=getc(f1);

while(isdigit(c))

{

tokenvalue*=10+c-'0';

c=getc(f1);

}

num[i++]=tokenvalue;

ungetc(c,f1);

}

else

if(isalpha(c))

{

putc(c,f2);

c=getc(f1);

while(isdigit(c)||isalpha(c)||c=='_'||c=='$')

{

putc(c,f2);

c=getc(f1);

}

putc(' ',f2);

ungetc(c,f1);

}

else

if(c==' '||c=='\t')

printf(" ");

  else

if(c=='\n')

lineno++;

else

putc(c,f3);

}

fclose(f2);

fclose(f3);

fclose(f4);

fclose(f1);

printf("\n The numbers in the program are :");

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

printf("%d", num[j]);

printf("\n");

f2=fopen("identifier", "r");

k=0;

printf("The keywords and identifiers are:");

while((c=getc(f2))!=EOF)

{

if(c!=' ')

str[k++]=c;

else

{

str[k]='0';

keyword(str);

k=0;

}

 }

 fclose(f2);

f3=fopen("specialchar","r");

printf("\n Special characters are : ");

while((c=getc(f3))!=EOF)

printf("%c",c);

printf("\n");

fclose(f3);

printf("Total number of lines are:%d", lineno);

f4=fopen("mathop","r");

printf("\n Relational mathematical operators are : ");

while((c=getc(f4))!=EOF)

printf("%c",c);

printf("\n");

fclose(f4);

}