C_str的入门级notes

嗯，受人所托，顺便整理的

英文渣

侵删。

// 注释的部分是解说(废话)和不怎么重(kǎo)要(chá)的

错误请指正

#include <stdio.h>
#include <string.h>
int main() {char str[] = "sstr";// "sstr." == 's', 's', 't', 'r', '\0'// without a '\0' it's usually not considered a c-style string// but a normal array of type char// many lib funcs need '\0' to identify a complete string
printf("%s\n", sstr);scanf("%s", sstr);  // stops reading when meets a spaceprintf("\n%s\n", sstr);gets(str);  // reads a full line until a '\n' // ('\n' not included)// puts(char[]) is less used, automatically '\n'int len = strlen(sstr);  // '\0' not included// strcat(aimStr, sourceStr);  // 2 '\0' needed and 1 remains// strcat(aimStr, sourceStr, n); // only n bytes// strcpy(aimStr, sourceStr (, n));// strcmp(strA, strB (, n)); // strA-strB  (the first n bits)// ascii bigger, string bigger// the longer, the bigger// strlwr(sstr); strupr(sstr);newStr = strstr(char* text, char* match);// char* arrayAddress = strrev(sstr);// strset etc, recommeding memset(void* _Dst, int _Val, size_t _Size);// mem.h or string.hdouble doublePrecision = strtod(strFloat, &endptr);// atoi，atol，strtod，strtol，strtoul// proto: longstrtol(char *str, char **endptr, int base);// for ioc = getchar();  // dangerous, '\n' and all asciis untouchedgets(sstr);  // '\n' is read and replaced by '\0'scanf(... , someStr)  // buf still holds '\n', ' ', etcscanf(... , &someChar)  // close to getchar()// for formatted io, related sources:// http://www.jb51.net/article/62358.htm// http://baike.baidu.com/link?url=Ijwdh1w3qXfTtff-WlPW1QowBiaCgE7zjVHAOT35VHDXtmz3MmQhPk7zs-_pc1_7rI9-AZRZr60hWlgzPeUzQa// focus:  operator precedence// file io is important but not in the range
}

　　by(无'\0')

　　by 百毒百科