C语言进阶课程学习记录-数组指针和指针数组分析

- 实验-数组指针的大小
- 实验-指针数组
- 小结

本文学习自狄泰软件学院唐佐林老师的 C语言进阶课程，图片全部来源于课程PPT，仅用于个人学习记录

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实验-数组指针的大小

#include <stdio.h>

typedef int(AINT5)[5];
typedef float(AFLOAT10)[10];
typedef char(ACHAR9)[9];

int main()
{
    AINT5 a1;
    float fArray[10];
    AFLOAT10* pf = &fArray;
    ACHAR9 cArray;

    char(*pc)[9] = &cArray;
    char(*pcw)[4] = cArray;

    int i = 0;

    printf("%d, %d\n", sizeof(AINT5), sizeof(a1));//20 20

    for(i=0; i<10; i++)
    {
        (*pf)[i] = i;
    }

    for(i=0; i<10; i++)
    {
        printf("%f\n", fArray[i]);
    }
    //0~9

    printf("%p, %p, %p\n", &cArray, pc+1, pcw+1);// pc+9 pcw+4

    return 0;
}

    /*
    output:
20, 20
0.000000
1.000000
2.000000
3.000000
4.000000
5.000000
6.000000
7.000000
8.000000
9.000000
0060FEAB, 0060FEB4, 0060FEAF
    */

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实验-指针数组

#include <stdio.h>
#include <string.h>

#define DIM(a) (sizeof(a)/sizeof(*a))

int lookup_keyword(const char* key, const char* table[], const int size)
{
    int ret = -1;

    int i = 0;

    for(i=0; i<size; i++)
    {
        if( strcmp(key, table[i]) == 0 )
        {
            ret = i;
            break;
        }
    }

    return ret;
}

int main()
{
    const char* keyword[] = {
            "do",
            "for",
            "if",
            "register",
            "return",
            "switch",
            "while",
            "case",
            "static"
    };

    printf("%d\n", lookup_keyword("return", keyword, DIM(keyword)));
    printf("%d\n", lookup_keyword("main", keyword, DIM(keyword)));

    return 0;
}


    /*
    output:
4
-1
    */