Thread: ASK

  1. #1
    Registered User
    Join Date
    Nov 2017
    Posts
    1

    Post ASK

    Hello guys,
    im a IT student and i am studying C right now,
    i have a problem in my program,
    i have created a Struct Linked List to Store array data type
    a program which store student data, input for name, nim, and, sex.
    i try , it's no problem at all
    but when i try to get it into a while loop,
    second loop will result skip input for var name,
    why this happen
    idk..
    i will be glad if u tell me why .. and give solution
    sorry for my bad engliish, it's not my native.
    Code:
    #include <stdio.h>
    #include <stdlib.h>
    
    
    typedef struct NodeStruct {
        char*nama;
        char*nim;
        char*sex;
        struct NodeStruct *next;
        
    } Node;
    void push(Node * head, Node * newNode) {
        Node * current = head;
        while (current->next != NULL) {
            current = current->next;
        }
    }
    void ql(){
        printf("\napakah anda ingin menginput lagi ? ");
            printf("\n1. Ya ");
            printf("\n2. Tidak ");
            printf("\nPilihanmu =  ");
    }
    
    
    
    
    void
    main (){
        Node *node1 = NULL;
        int q=1;
        node1=(Node*)malloc(sizeof(Node)); 
            node1->nama=(char*)malloc(sizeof(char));
            node1->sex=(char*)malloc(sizeof(char));
            node1->nim=(char*)malloc(sizeof(char));
            printf("\nNama                  = "); gets(node1->nama);
            printf("\nNIM                 = "); gets(node1->nim);
            printf("\nJenis Kelamin (L/P)      = "); gets(node1->sex);
            
            node1->next=NULL;
        
         while (q==1) {
         
        
            
        
        Node *newNode;
            newNode=(Node*)malloc(sizeof(Node));
            newNode->nama=(char*)malloc(sizeof(char));
            newNode->sex=(char*)malloc(sizeof(char));
            newNode->nim=(char*)malloc(sizeof(char));
        
        printf("\n\nNama                  = "); gets(newNode->nama);
        printf("\nNIM                 = "); gets(newNode->nim);
        printf("\nJenis Kelamin (L/P)      = "); gets(newNode->sex);
        
        newNode->next = NULL;
        push(node1,newNode);
        ql();
        scanf("%d",&q);
            
        
    } 
    }

  2. #2
    Programming Wraith GReaper's Avatar
    Join Date
    Apr 2009
    Location
    Greece
    Posts
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    That happens because you do scanf("%d",&q); at line #60. scanf() tends to leave the newline character behind, and the next time you call gets() it thinks that was the next line. Right after the scanf, do something like this to "flush" the input:
    Code:
    {
        int c;
        while ((c = getchar()) != '\n' && c != EOF) {
            continue;
        }
    }
    Now that I answered your question, please take a moment to read why some parts of your code should be changed:
    Why gets() is bad
    Casting malloc
    void main() - the Wrong Thing

    Also these:
    Importance of code indentation
    How to ask questions the smart way
    Last edited by GReaper; 11-19-2017 at 06:47 AM.
    Devoted my life to programming...

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