CODEWITHSUNDEEP
cfile
Super Learner
Super Learner

Reputation: 151

reading file error in c language

I have write a code for read from file , which has the following contant : 76 -1217454080 77 -1217458176 78 -1217462272 by this code : 

FILE* fp;
        if((fp = fopen("test" , "r")) < 0 )
            printf("ERROR in FILE \n") ;
        int old_fp = fp ;
        int shm , key ;
        fp = fscanf(fp , " %d%d" , &key , &shm) ;
        if(fp < 0)
            printf("ERROR in fscanf \n ");
        printf("%d , %d \n " , key , shm) ;
        while( fp != EOF)
        {
            if(key == 5)
                break ;

            fp = fscanf(fp , "%d" , &key) ;
            fp = fscanf(fp , "%d" , &shm) ;
            printf("%d , %d\n" , key , shm) ;
        }

but when reach the loop (enter the loop) the program give me segmentation fault , so i have tried ny this code (which is make first statement read 4 integers at the same time ) and it works for reading 4 integers at same time , but it again when it enter the loop , and it want to do fscanf , the program crash !

 FILE* fp;
            if((fp = fopen("test" , "r")) < 0 )
                printf("ERROR in FILE \n") ;
            int old_fp = fp ;
            int shm , key ;
                    int ss , kk ;
            fp = fscanf(fp , "%d%d%d%d" , &key , &shm,&ss,&kk) ;
            printf("the  result is %d %d " , ss , kk );
            if(fp < 0)
                printf("ERROR in fscanf \n ");
            printf("%d , %d \n " , key , shm) ;
            while( fp != EOF)
            {
                if(key == 5 )
                    break ;
    // it's crash here
                fp = fscanf(fp , "%d" , &key) ;
                fp = fscanf(fp , "%d" , &shm) ;
                printf("%d , %d \n " , key , shm) ;
            }

Upvotes: 0

Views: 176

Answers (1)

Andro
Andro

Reputation: 2232

fp = fscanf(fp , "%d" , &key);

You are destroying your fp! fscanf returns an int and fp is of type FILE*.

Upvotes: 6

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