从类型“struct”向类型“int”赋值时不兼容的类型，反之亦然

Question

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <string.h>
struct protein
{
    char proteinBrand[100];
    int currentStock;
    int unitsSold;
    double averageReview;
    int totalReviews;
};

void selection_sort(struct protein protein_powders[], int n)
{
    int i, largest = 0, temp;
    if (n == 1)
            return;
    for (i = 1; i < n; i++)
            if (protein_powders[i].averageReview < protein_powders[largest].averageReview)
                    largest = i;
    if (largest < n - 1) {
            temp = protein_powders[n-1];
            protein_powders[n-1] = protein_powders[largest];
            protein_powders[largest] = temp;
    }
}

有问题的代码行是

temp = protein_powders[n-1];

和

protein_powders[largest] = temp;

我得到了这些编译器错误，我真的不知道要修改什么。我在C语言方面没有太多的经验，所以如果有任何帮助，我将不胜感激！

incompatible types when assigning to type ‘int’ from type ‘struct protein’

incompatible types when assigning to type ‘struct protein’ from type ‘int’

Answer 1

现在，您正在尝试将protein类型的元素赋给一个整数变量。就像我在我的评论中指出的那样，temp应该被声明为结构，以使用您现在所做的方式：

// Declare temp as a struct.
struct protein temp;

// And then use it.
temp = protein_powers[n-1];

如果你只想赋值，你可以这样做：

int temp = protein_powers[n-1].currentStock;