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

void CountWords(FILE*fptr);
void findOccuence(FILE*fptr);
void replaceString(FILE*fptr);

int main()
{
int choice;
FILE*fptr;

fptr=fopen("text.dat","r");
if (fptr==NULL)
{
printf("ERROR!! THE FILE CAN NOT BE OPEND!\n");
exit(0);
}

do
{
printf("1.CountWords");
printf("2.findOccuence");
printf("3. ");
printf("4.replaceString");

printf("\nEnter your choice\n1\t To Count Words In Each Lines.\n2\tTo Find The Number OF The String Occurred In Each Lines.\n3\t To Replace Strings.\n");
scanf("%d",&choice);

switch(choice)
{
case 1: CountWords(fptr);
break;

case 2: findOccuence(fptr);
break;

case 3:replaceString(fptr);
break;
case 4:exit(1);
}
}while(choice>0 && choice<4);

fclose(fptr);

return 0;
}
void CountWords(FILE*fptr)
{
rewind(fptr);
char line[60];
fgets(line,60,fptr);

while(!feof(fptr))
{
char a[20];
int count=0;
int countLines=0;

char*ptr=strtok(line,".");

while(ptr!=NULL)
{
a[countLines]=ptr;
ptr=strtok(NULL,".");
countLines++;
} // end while

printf("Sentences Length:\n");

for(int i=0;i<countLines;i++)
{
char*token=strtok(a," ");
while(token!=NULL)
{
count++;
token=strtok(NULL," ");
} // end while
printf("\t\t Sentence%d:%words",i+1,count);
fgets(line,60,fptr);

count=0;
} // end for
}// end outer while
}

void findOccuence (FILE*fptr)
{
rewind(fptr);
char line [60];
fgets(line,60,fptr);

while(!feof(fptr))
{
int count=0;
int countLines=0;
char*ptr=strstr(line,"string");

while(ptr!=NULL)
{
count++;
countLines++;
ptr=strstr(ptr+1,"string");
} // end inner while

printf("%d\t%d\n",countLines,count);
fgets(line,60,fptr);
} // end outer while

}

void replaceString(FILE*fptr)
{
rewind (fptr);
FILE*fptr2;
char line[60];
char string1=" "; string2=" ";

fgets(line,60,fptr);
while(!feof(fptr))
{
char*token=strtok(line," ");
while(token!=NULL)
{
if(strlen(token)==strstr(line,string1));
strcat(line,string2);
char*token=strtok(line," ");
}

fputs(line,fptr2);

}

}