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《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);
}

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bytesprintf("%lu\n", sizeof(p)); //8, 64位的电脑}

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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