Errors in scanf and scanf_s

[casybay]

Hi all,

I am having a strange problem when I run the scanf. The following is my code:

  int main(int argc, char** argv){
     
     int result;
     
     char* Y = (char*)malloc(sizeof(char)*MAXLENGTH);
     
     printf("Enter the target DNA sequence :");
     result = scanf_s("%c",&Y);
     if(result == EOF){
        printf("Read no character.\n");
        return 1;
     }
     
     char* X = (char*)malloc(sizeof(char)*MAXLENGTH);
     printf("\nEnter the query DNA sequence :");
     result = scanf_s("%c",&X);
     printf("\n");
     if(result == EOF){
        printf("Read no character.\n");
        return 1;
     }
     
     runSW(X,Y);
     CUT_EXIT(argc, argv);
}

The target DNA sequence can be entered. But the program stops as soon as I enter the sequence.
Could anyone give me a hint why this happens?
Thx.

[oler1s]

Explain to me the use of %c in your scanf call.

[MonaLisaO]

Hi all,

I am having a strange problem when I run the scanf. The following is my code:

  int main(int argc, char** argv){
     
     int result;
     
     char* Y = (char*)malloc(sizeof(char)*MAXLENGTH);
     
     printf("Enter the target DNA sequence :");
     result = scanf_s("%c",&Y);
     if(result == EOF){
        printf("Read no character.\n");
        return 1;
     }
     
     char* X = (char*)malloc(sizeof(char)*MAXLENGTH);
     printf("\nEnter the query DNA sequence :");
     result = scanf_s("%c",&X);
     printf("\n");
     if(result == EOF){
        printf("Read no character.\n");
        return 1;
     }
     
     runSW(X,Y);
     CUT_EXIT(argc, argv);
}

The target DNA sequence can be entered. But the program stops as soon as I enter the sequence.
Could anyone give me a hint why this happens?
Thx.

Is your result really EOF? Is that why you are returning? What line does your execution stop on? Have you tried running this with a debugger attached?

~mona