Escape scanf within a while loop

Question

I have this sheet of code:

listCh remplir(){
    char rep;
    listCh l,aux,p;
    printf("1-veuillez entrer un element?(n pour quitter)\n");
    scanf("%c",&rep);
    if(rep=='n')
        l=NULL;
    else{
        l=malloc(sizeof(listCh));
        printf("2-Donnez la valeur d element!\n");
        scanf("%d",&l->valeur);
        p=l;
    }
    while(rep!='n'){
        printf("voulez-vous ajouter un nouveau element de la list? (n pour quitter)\n");
        scanf("%c",&rep);
        if(rep!='n'){
            aux=malloc(sizeof(listCh));
            printf("Donnez la valeur d element!\n");
            scanf("%d",aux->valeur);
            p->suiv=aux;
            p=aux;
        }
        else{
            p->suiv=NULL;
        }

    }
    return l;
}

There is no error while executing ! But, the problem is that my program escapes the first "scanf" function in the "while" loop.

I didn't find an explanation for this.

I need some help please.

Many thanks :)

Possible duplicate of [Reading newline from previous input when reading from keyboard with scanf()](http://stackoverflow.com/questions/29905009/reading-newline-from-previous-input-when-reading-from-keyboard-with-scanf) — MikeCAT, Dec 02 '15 at 00:04
Really no error? `listCh l; l=malloc(sizeof(listCh));` seems strange. — MikeCAT, Dec 02 '15 at 00:05
1) `scanf("%d",&(aux->valeur));` (add &) Check your compiler setting. A good compiler would warn about this. 2) `scanf("%c",&rep);` --> `scanf(" %c",&rep);` (add space) — chux - Reinstate Monica, Dec 02 '15 at 00:11

score 3 · Accepted Answer · answered Dec 02 '15 at 00:14

3

Always remember to put a space before %c when scanf() a character variable. A bit unusual, but that's how to skip all the buffered spaces in the input stream before you can get the real character.

scanf("%c",&rep); should be scanf(" %c",&rep);

answered Dec 02 '15 at 00:14

artm

17,291
6
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score 1 · Answer 2 · answered Dec 02 '15 at 00:02

1

It is probably reading your enter from your first scanf.
Try putting a getchar() before your scanf on the loop

answered Dec 02 '15 at 00:02

Jorgel

920
3
14
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Escape scanf within a while loop

2 Answers2