如何将用户输入字符串与C文件中的字符串进行比较

Question

So Im trying to make a program that searches in a file for a word that the user inputs. If theres a match, it say "FOUND IT", if it couldnt find anything, it says " COULDNT FIND ANYTHING" (obviously :p). Im not clear at how to scan the file for the word that the user chooses (writes through scanf).

Here's my (non-functional) code. Thanks for any advice !

#include "stdafx.h"
#include <conio.h>
#include <iostream>
#include <string.h>
#include <string>
#define slovo 255

using namespace std;
 int _tmain(int argc, _TCHAR* argv[])
{
int i;
char secret[slovo];
int outexists,fileexists;
system("Color 02");

setlocale(LC_ALL, "");
FILE*out = fopen("additions.txt", "w+");
if (!out)
{
    perror("additions.txt");
    getchar();
    return 1;

}
else
{
    outexists = 1;
}
FILE*file = fopen("db.txt", "r");

if (!file)
{

    perror("db.txt");
    getchar();
    return 1;

}
else
{
    fileexists = 1;
}
char artist[slovo];

printf("Welcome, hit ENTER to start looking.\n");
getchar();
printf("Please enter for the word you wish to search for in our database !
\n    ");

scanf("%s",&artist);



**/* THIS PART */** if (fileexists == 1 && outexists == 1)
    {
        while (fscanf(file, "%c", secret) != EOF){

            { if (!strncmp(secret, artist, sizeof(artist)))
            {
                printf("FOUND IT \n");
                fclose(file);
            }
            else
            {
                printf("COULDNT FIND IT \n");
                fclose(file);

            }
            }

        }


}







printf("Which word do you wish to add  ?\n");
scanf("%s", artist);
fprintf(out, "%s", artist);
printf("done! \n");
getchar();




fclose(file);
fclose(out);


getchar();



return 0;

}

Answer 1

You probably need the conversion pattern %s instead of %c , the latter read only one char. the former reads a string.

fscanf(file, "%s", secret)

EDIT

just saw that too,

fclose(file);

you close the file in both the if and the else inside the while loop after only one fscanf + strncmp . do not do that, close the file after the wile loop has terminated.

Also simply use strcmp instead of strncmp .

EDIT 2

So, after copy pasting you 'tricky' code which btw, turned my console font color into green, I was able to find a word in a text file:

First get rid of that getchar(); !

printf("Welcome, hit ENTER to start looking.\n");
getchar();

I was always typing the key to search for after the Welcome, hit ENTER to start looking. is printed and when hitting enter, nothing is read because getchar() was waiting for input.

second

scanf("%s",&artist);

is not correct, use

scanf("%s", artist);

instead, no need to pass the address, it's already an array!

printf("Welcome, hit ENTER to start looking.\n");
printf("Please enter for the word you wish to search for in our database !\n");
scanf("%s",artist);
if (fileexists == 1 && outexists == 1) {
    char found = 0;
    while (fscanf(file, "%s", secret) != EOF) {
        if (!strcmp(secret, artist)) {
            found = 1;
            break;
        }
    }
    fclose(file);
    if(found) {
        printf("FOUND IT \n");
    } else {
        printf("COULDNT FIND IT\n");
    }
}

Answer 2

hey i encountered a similar problem where i tried to read a string, for example a name, and compare it with the user input or a pre-stored string. However after a while i realised that you have to do a few things to make it work....

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

int main()
{
    int i;
    int j;
    int y;
    char name_read[100];
    char Testarr[100];
    FILE *file = fopen("C:/Documents/readfile", "w+");//opened text file for writing



    fprintf(file,"George|\n");// note i wrote the name "George" and put a '|' at the end


    fclose(file);

    char name_stored[100] = "George";//store the name we want to find
    char str[100] = "";

    FILE *ptr = fopen("C:/Documents/readfile","r");//open file for reading
 printf("reading variables\n");

//loop everything below for reading multiple lines
   fgets(name_read, 100, ptr);//read the name from the file



  for(j = 0; j<= 100; j++){
     if(name_read[j] == '|'){//check to see if we reached the marker '|'

        for(i = 0; i<j; i++){
            str[i] = name_read[i];//copy everything before the marker into str
           }

       }
  }

 printf("\n%s\n", str);

   if(!strcmp(str, name_stored)){//compare the name we read from the file with the name stored
    printf("match successful");
   }

   }

Note however that if you want to read multiple lines of names you can implement any loop you want.