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Kanwar's questions

Martin Hope
Kanwar
Asked: 2025-04-20 09:42:22 +0800 CST
  • 6

我正在尝试初始化在 C 结构中声明的数组。

目标是使用一个数组并将其作为参数传递给一个函数，然后该函数复制传递的数组的每个元素并将其分配给结构内的数组。

#include <stdio.h>


typedef struct {
    int v;
    int arrayInStruct[];
} TEST;

void ProblemCode1(){
    TEST test1; //Array Declared after struct declaration.
    int array[5] = {1,2,3,4,5};
    for(int i = 0; i < 5; i++){
        test1.arrayInStruct[i] = array[i];
        printf("%d", test1.arrayInStruct[i]);
    }
    return;
}

void ProblemCode2(int a[]){
    //Array Pass by Value and elements assigned to struct array.
    TEST test2;
    test2.arrayInStruct[5] = 0;
    for(int i = 0; i < 5; i++){
        test2.arrayInStruct[i] = a[i];
        printf("%d", test2.arrayInStruct[i]);
    }
    return;
}


void ProblemCode3(int a[]){
    //Array Pass by Value and elements assigned to struct array 
    //and struct array initilzation missing as compared to ProblemCode2.
    TEST test2;
    for(int i = 0; i < 5; i++){
        test2.arrayInStruct[i] = a[i];
        printf("%d", test2.arrayInStruct[i]);
    }
    return;
}

void WorkingCode1(){
    int array[5] = {1,2,3,4,5};
    TEST test1; //Array Created Before Declaration of Struct and not passed via function.
    for(int i = 0; i < 5; i++){
        test1.arrayInStruct[i] = array[i];
        printf("%d", test1.arrayInStruct[i]);
    }
    printf("\n");
    return;
}

void WorkingCode2(){
    int array1[5] = {1,2,3,4,5};
    int array2[5] = {0};
    for(int i = 0; i < 5; i++){
        array2[i] = array1[i];
        printf("%d", array2[i]);
    }
    printf("\n");
    return;
}

int main(){
    //int passbyValue[] = {1,2,3,4,5};
    //ProblemCode1();
    //ProblemCode2(passbyValue);
    //ProblemCode3(passbyValue);
    WorkingCode1();
    WorkingCode2();
    return 0;
}

有人可以解释一下为什么某些功能有效而其他功能无效吗？

arrays