c - 从类型 'int’ 分配给类型 ‘struct' 时类型不兼容，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;
    }
}

有问题的行是

temp = protein_powders[n-1];

和

protein_powders[largest] = temp;

我收到这些编译器错误，但我真的不知道要更改什么。我在 C 方面不太有经验，所以任何帮助将不胜感激!:

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 类型的元素分配给整数变量。就像我在评论中指出的那样，temp 应该声明为一个结构，以便按照您现在的方式使用:

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

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

如果您的意图只是分配一个值，您可以这样做:

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