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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdlib.h>
  4. #include <stdbool.h>
  5.  
  6. struct node {
  7.   char key;
  8.    int data;
  9.    struct node *next;
  10. };
  11. struct node *head = NULL;
  12. struct node *current = NULL;
  13.  
  14. //insert link at the first location
  15. void insertFirst(int key, int data) {
  16.    //create a link
  17.    struct node *link = (struct node*) malloc(sizeof(struct node));
  18.  
  19.    link->key = key;
  20.    link->data = data;
  21.  
  22.    //point it to old first node
  23.    link->next = head;
  24.  
  25.    //point first to new first node
  26.    head = link;
  27. }
  28.  
  29. //display the list
  30. void printList() {
  31.    struct node *ptr = head;
  32.    printf("\n[ ");
  33.  
  34.    //start from the beginning
  35.    while(ptr != NULL) {
  36.       printf("(%c,%d) ",ptr->key,ptr->data);
  37.       ptr = ptr->next;
  38.    }
  39.  
  40.    printf(" ]");
  41. }
  42.  
  43. int main() {
  44.    insertFirst('A',300);
  45.    insertFirst('B',0);
  46.    insertFirst('C',100);
  47.    insertFirst('D',200);
  48.  
  49. struct node *tmp = head;
  50. int avg=0;
  51.  while(tmp != NULL) {
  52.       avg=avg+tmp->data;
  53.       tmp = tmp->next;
  54.    }
  55. avg=avg/4;
  56. printf("avg=%d\n",avg);
  57.    printf("Original List: "); 
  58.    //print list
  59.    printList();
  60.  
  61.  
  62. 	return 0;
  63. }
  64.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
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Standard input is empty
stdout
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avg=150
Original List: 
[ (D,200) (C,100) (B,0) (A,300)  ]
https://ideone.com/A7zYLe
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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