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/*  PHONENUM.C -- Searches a file for a phone number using a person's lastname. 
    also allows new names to be added by passing "Enter" as the lastname.  */ 
 
#include  
#include  
#include  
 
/*  Create a structure template for the structure with the tag "record".  */ 
 
struct record { 
		char lastname[31]; 
		char firstname[16]; 
		char phonenum[13]; 
	      }; 
 
FILE *fptr; 
 
void main(int argc, char *argv[]) 
{ 
	struct record inputt; 
	int count = 0; 
	int names = 0; 
 
    /*  Check to make sure enough arguements were passed.  If not, display 
    an error message.  */ 
	 
    if(argc == 1) 
	{ 
		puts("\nUsage:  PHONENUM  "); 
		puts("\nWhere  is the lastname of the person."); 
		puts("In order to add names to the file, enter the"); 
		puts("word 'Enter' as the name of the person."); 
		exit(1); 
	} 
	 
    /*  If "Enter" was entered as the lastname, allow user to add a record.  */ 
 
	if(strcmpi("enter", argv[1]) == 0) 
	{ 
 
		/*  Open the file for storing the entered data.  */ 
 
		if((fptr=fopen("input","ab")) == NULL) 
		{ 
			printf("\nCannot open file for storing data."); 
			exit(1); 
		} 
 
		/*  Get the input data from the user and write it to the data file.  */ 
 
		printf("\nEnter last name:  "); 
		gets(inputt.lastname); 
 
		printf("\nEnter first name:  "); 
		gets(inputt.firstname); 
 
		printf("\nEnter phone number (XXX-XXX-XXXX):  "); 
		gets(inputt.phonenum); 
 
		fwrite(&inputt, sizeof(inputt), 1, fptr); 
 
		/*  Close the data file.  */ 
 
		fclose(fptr); 
 
		exit(0); 
 
	} 
 
 
	/*  Open data file for reading.  */ 
 
	if((fptr=fopen("input","rb")) == NULL) 
	{ 
		puts("\nCannot open file for reading data."); 
		exit(1); 
	} 
 
	/*  Search for a lastname in the file, which matches the arguement.  If 
	    there is a match, print the name.  Keep count of the number of times 
	    through the loop.  */ 
 
	do 
	{ 
		fread(&inputt,sizeof(inputt),1,fptr); 
		if(strcmpi(inputt.lastname, argv[1]) == 0) 
		{ 
			printf("\n%s %s:  %s", inputt.firstname, inputt.lastname, inputt.phonenum); 
			names++; 
		} 
		count++; 
	}while(count < 10);  /*  For this example, a limit of ten names.  */ 
 
    /*  If there was no name, print mesage.  */ 
 
	if(names == 0) 
		puts("\nNo name found."); 
 
	/*  Close data file.  */ 
 
	fclose(fptr); 
 
}