Programming abstractions in C 阅读笔记:p76-p83

2023-08-08
广东
本文字数：1096 字
阅读完需：约 4 分钟

《Programming Abstractions In C》学习第 42 天，p76-p73 总结。

一、技术总结

1.数组和指针

在 C 语言中，数组和指针非常相似，相似到必须将它们同时考虑，当看到数组就应该想到指针，当看到指针就应该想到数组。示例：

#include <stdio.h>
int SumIntegerArray(int array[], int n);int SumIntegerArray2(int *array, int n);
/* * SumIntegerArray:数组求和，数组用法*/int SumIntegerArray(int array[], int n) {    int i, sum;
    sum = 0;    for (i = 0; i < n; i++) {        sum += array[i];    }    return sum;
}
/* * SumIntegerArray2：数组求和指针用法*/int SumIntegerArray2(int *ip, int n) {    int i, sum;
    sum = 0;    for (i = 0; i < n; i++) {        sum += *ip++;    }    return sum;
}void main() {    int aSum, pSum;    int array[] = {1, 2, 3, 4, 5};
    aSum = SumIntegerArray(array, 5);    printf("对数组[1, 2, 3, 4, 5]求和: aSum=%d\n", aSum);
    pSum = SumIntegerArray2(array, 5);    printf("对数组[1, 2, 3, 4, 5]求和: pSum=%d\n", aSum);}

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那么数组和指针有什么不同呢?声明的时候内存分配不一样。示例：

#include <stdio.h>
void main() {    int array[5];    int *p;
    printf("%lu\n", sizeof(array)); //20, int类型占4bytes,5个元素占20个bytes    printf("%lu\n", sizeof(p)); //8, 64位的电脑
}

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二、英语总结

1.difference 和 distinctiond 的区别？

答：网上查找了一番，对于各种回答还是不大满意，先记着：

（1）stack exchange:"Difference" is a much more generic work just referring to set of attributes that are different between two or more things in a set. "Distinction" is much more specific and often separates ONE item above and beyond the other differences in a set. E.g:All people have differences, but some have the distinction of being famous.

三、参考资料

1.编程

1)Eric S.Roberts，《Programming Abstractions in C》：https://book.douban.com/subject/2003414

2.英语

1)Etymology Dictionary：https://www.etymonline.com

2)Cambridage Dictionary：https://dictionary.cambridge.org

3)Merrian-Webster Dictionary：https://www.merriam-webster.com

4)Collins Dictionary：https://www.collinsdictionary.com

5)Oxford Dictionary：https://www.oxfordlearnersdictionaries.com

6)The Free Dictonary：https://www.thefreedictionary.com

7)Urban Dictionary：https://www.urbandictionary.com

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