Three forms of assigning values ​​to arrays in C language

Three forms of assignment to arrays in C language

In C language, three forms of assignment to arrays

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1. Through the form of loop, that is: array name [subscript], assign values ​​to the elements of the array in sequence

#include <stdio.h>
int main()
{
    int i;
    
    int a[10] = {0};
    for(i=0;i<10;i++)
    {
         scanf("%d",&a[i]);
    }
    for(i=0;i<10;i++)
    {
        printf("%d ",a[i]);
    }
    return 0;
}

2. Assign values ​​to the elements of the array in sequence through the form of a loop Array name subscript

#include <stdio.h>
int main()
{
    int i;
    int a[5];   // 数组名：a 是数组首元素的地址 -----相当于一个指针  是一个常量  
                //指针+整型值，表示地址的前移，前移的字节由指针指向的对象的类型决定
                //b+1;  前移4个字节（int型）
 
    printf("%#p\n",a);        //打印输出数组a的地址 相当于a[0]的地址
    printf("%#p\n",&a[0]);
    printf("%#p\n",a+1);
    printf("%#p\n",&a[1]);
    printf("%#p\n",a+2);
    printf("%#p\n",&a[2]);
 
    printf("请输入数组a元素的值：");
    for(i=0;i<5;i++)
    {
        scanf("%d",a+i);     //赋值给数组a
    }
    printf("a数组元素的值为：");
    for(i=0;i<5;i++)
    {
         printf("%d ",*(a+i));
    }
    return 0;
}

The printed result:

3. Use pointers to assign values ​​to the elements of the array in sequence through loops

 #include <stdio.h>
int main()
{
    int i;
    int d[5] = {10,20,34,89,90};
    //指针指向一维数组，指针指向数组首元素
       //数据类型 *指针名;
    int *p = d;
    //int *p = &d[0];
 
    //指针指向数组首元素。指针名可以当数组名使用
 
 
        printf("%#p\n",p);
        printf("%d\n",d[0]);
        printf("%d\n",*++p); //++p p的地址先偏移， *p
        printf("%d\n",d[1]);
        printf("%#p\n",p);
        printf("%#p\n",&d[1]);
 
    printf("请输入数组d元素的值：");
 
    p = d;
    for(i = 0; i < 5; i++)
    {
        //scanf("%d",p+i);  //p+0 p+1 p+2 p+3
         scanf("%d",p++);  //p = p+1
    }
    //for循环结束，p偏移到元素d[4]的下一个元素
    p = &d[0];
    for(i = 0; i < 5; i++)
    {
        //printf("%d ",*(p+i));
        //printf("%d ",*p++);  //p++,后置  *p取p变化之前的内容
        printf("%d ",p[i]);  //指针指向数组首元素。指针名可以当数组名使用
    }
    printf("\n-----------------\n");
 
 
    return 0;
}

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