Question

因此,我的准则...... 我的理解是,我应设立一个职能“地图”,作为理由发挥作用。它没有按计划进行。任何帮助都是完全令人惊讶的。

这里有可编纂的(并非可编纂的,但可以缩小的)守则版本:

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
int main(int argc, const char *argv[])
{
//it should be apparent that I am quite new to C, I have some java experience.
struct linkedList {
   int count;
   int num;
   struct linkedList *next;
};
struct linkedList *head, *tail, *curr;
int count1=0;
int i=0;

int square(int v) {return v=v*v;}

void map(int (*func)(int v), struct linkedList){
    struct linkedList2 *head, *tail, *curr;
    for(curr=head; curr!=NULL; curr=curr->next){
        curr->num=func(curr->num);
        printList();
    }
}

void start(){
    printf("This program will ONLY accept integer input.
");
    head=NULL;
    for(i=1;i<=4;i++) {
        count1++;
        curr=malloc(sizeof(struct linkedList));
        curr->count=count1;
        printf("Enter a number: ");
        scanf("%d", &curr->num);
        if(head==NULL) { head=curr; }
        else { tail->next=curr; }
        tail=curr;
        tail->next=NULL;
    }
    printf("A list has been created.
");
}

void printList(){
    printf("The list now contains these numbers: ");
    for(curr=head;curr!=NULL;curr=curr->next){
        printf("%d, ", curr->num);
    }
    printf("
");
}

 start();
 printList();

 map(square, linkedList);
 printList();
 system("PAUSE");   
 return 0;
}

Answer 1

在<代码>main内界定所有这些组成部分和职能,并不是你为什么要写C. Move the int main(int argc, const char *argv[]{,在后正确。 ∗∗∗∗ 仅载有<代码>main的实际代码。

Moreover, your definition of map appears to have an unfinished prototype. Instead of void map(int (*func)(int v), struct linkedList), in which the second parameter is unused, you want void map(int (*func)(int v), struct linkedList* head) (and then get rid of the declaration of head on the next line). Moreover, linkedList2 here presumably should be changed to linkedList. In addition, your attempt to call map in main with map(square, linkedList) is nonsensical; you want to use map(square, head).

友情链接