strcmp

Inlining this function or not?

我是研究僧i 提交于 2019-12-07 12:22:57
问题 I'm supposed to implement a function which compares two strings simliar so strcmp but ignoring whitespace characters, so strcmpignorews("abc ", " a b c") should give the same result. Here's my implementation: namespace { void SkipWhitespace(const char *&s) { for (; std::isspace(*s, std::locale::classic); ++s); } } int strcmpignorews(const char *s1, const char *s2) { for (; *s1 != '\0' && *s2 != '\0'; ++s1, ++s2) { SkipWhitespace(s1); SkipWhitespace(s2); if (*s1 != *s2) { break; } } return (

C++常用字符串函数使用整理

一曲冷凌霜 提交于 2019-12-07 11:22:26
C++常用字符串函数使用整理 strlen(字符数组) 功能:求字符串长度。 说明:该函数的实参可以是字符数组名,也可以是字符串。 使用样例: char s1[80] = "China"; cout<<strlen(s1)<<'\n';      //输出结果为5 cout<<strlen("大学生")<<'\n';   //输出结果为6  结果说明:一个汉字有两个字节,所以strlen("大学生")的结果为6。 strcpy(字符数组1,字符数组2) 功能:将字符数组2中的字符串复制到字符数组1中 说明: (1)字符数组1的长度必须大于等于字符数组2的长度。 (2)复制时连同字符串后面的'\0'一起复制到字符数组1中。 (3)不能用赋值语句将一个字符串常量或字符数组直接赋给一个字符数组。 (4)字符数组的复制只能用strcpy函数处理。用一个赋值语句只能将一个字符赋给一个字符型变量或字符型数组元素。但可以在定义的时候初始化。 如以下形式: str1 ={''Good"};    //不合法 str1 = str2;      //不合法 char a[5],c1,c2; c1 = 'A'; c2 = 'B';    //合法 c[0] = 'C';       //合法 char g[20] = "aaaa''   //合法 使用样例: `char a[20]="aaaaaa"

c - strcmp not returning 0 for equal strings

匆匆过客 提交于 2019-12-07 02:44:33
问题 So I've tried searching for a solution to this extensively but can only really find posts where the new line or null byte is missing from one of the strings. I'm fairly sure that's not the case here. I am using the following function to compare a word to a file containing a list of words with one word on each line (dictionary in the function). Here is the code: int isWord(char * word,char * dictionary){ FILE *fp; fp = fopen(dictionary,"r"); if(fp == NULL){ printf("error: dictionary cannot be

Strcmp for cell arrays of unequal length in MATLAB

余生长醉 提交于 2019-12-07 02:02:46
问题 Is there an easy way to find a smaller cell array of strings within a larger one? I've got two lists, one with unique elements, and one with repeating elements. I want to find whole occurrences of the specific pattern of the smaller array within the larger. I'm aware that strcmp will compare two cell arrays, but only if they're equal in length. My first thought was to step through subsets of the larger array using a loop, but there's got to be a better solution. For example, in the following:

C - Comparing numeric strings

独自空忆成欢 提交于 2019-12-07 01:01:20
问题 Out of professional curiosity, what is the safest / fastest / most efficient way to compare two fully numeric strings in C? #include <stdio.h> #include <string.h> #include <stdlib.h> int main(void){ char str1[5] = "123"; char str2[5] = "123"; char *ptr; if(atoi(str1) == atoi(str2)) printf("Equal strings"); if(strtol(str1,&ptr,10) == strtol(str2,&ptr,10)) printf("Equal strings"); if(strcmp(str1,str2)==0) printf("Equal strings"); return 0; } 回答1: strcmp () in my opinion, as it does not need any

Inlining this function or not?

折月煮酒 提交于 2019-12-05 18:43:23
I'm supposed to implement a function which compares two strings simliar so strcmp but ignoring whitespace characters, so strcmpignorews("abc ", " a b c") should give the same result. Here's my implementation: namespace { void SkipWhitespace(const char *&s) { for (; std::isspace(*s, std::locale::classic); ++s); } } int strcmpignorews(const char *s1, const char *s2) { for (; *s1 != '\0' && *s2 != '\0'; ++s1, ++s2) { SkipWhitespace(s1); SkipWhitespace(s2); if (*s1 != *s2) { break; } } return (*s1 < *s2) ? -1 : ((*s1 == *s2) ? 0 : 1); } Now, the question is, would it make sense to inline the

c - strcmp not returning 0 for equal strings

萝らか妹 提交于 2019-12-05 08:14:40
So I've tried searching for a solution to this extensively but can only really find posts where the new line or null byte is missing from one of the strings. I'm fairly sure that's not the case here. I am using the following function to compare a word to a file containing a list of words with one word on each line (dictionary in the function). Here is the code: int isWord(char * word,char * dictionary){ FILE *fp; fp = fopen(dictionary,"r"); if(fp == NULL){ printf("error: dictionary cannot be opened\n"); return 0; } if(strlen(word)>17){ printf("error: word cannot be >16 characters\n"); return 0

什么是数据驱动编程

送分小仙女□ 提交于 2019-12-05 06:49:11
转自: https://blog.csdn.net/chgaowei/article/details/6658260 前言: 最近在学习《Unix编程艺术》。以前粗略的翻过,以为是介绍unix工具的。现在认真的看了下,原来是介绍设计原则的。它的核心就是第一章介绍的unix的哲学以及17个设计原则,而后面的内容就是围绕它来展开的。以前说过,要学习适合自己的资料,而判断是否适合的一个方法就是看你是否能够读得下去。我对这本书有一种相见恨晚的感觉。推荐有4~6年工作经验的朋友可以读一下。 正题: 作者在介绍Unix设计原则时,其中有一条为“表示原则:把知识叠入数据以求逻辑质朴而健壮”。结合之前自己的一些经验,我对这个原则很有共鸣,所以先学习了数据驱动编程相关的内容,这里和大家分享出来和大家一起讨论。 数据驱动编程的核心 数据驱动编程的核心出发点是相对于程序逻辑,人类更擅长于处理数据。数据比程序逻辑更容易驾驭,所以我们应该尽可能的将设计的复杂度从程序代码转移至数据。 真的是这样吗?让我们来看一个示例。 假设有一个程序,需要处理其他程序发送的消息,消息类型是字符串,每个消息都需要一个函数进行处理。第一印象,我们可能会这样处理: void msg_proc(const char *msg_type, const char *msg_buf) { if (0 == strcmp(msg_type,

Strcmp for cell arrays of unequal length in MATLAB

ぐ巨炮叔叔 提交于 2019-12-05 06:47:00
Is there an easy way to find a smaller cell array of strings within a larger one? I've got two lists, one with unique elements, and one with repeating elements. I want to find whole occurrences of the specific pattern of the smaller array within the larger. I'm aware that strcmp will compare two cell arrays, but only if they're equal in length. My first thought was to step through subsets of the larger array using a loop, but there's got to be a better solution. For example, in the following: smallcellarray={'string1',... 'string2',... 'string3'}; largecellarray={'string1',... 'string2',...

Compare between a char in a string to a given char

笑着哭i 提交于 2019-12-05 02:37:43
I have the following: int findPar(char* str) { int counter=0; while (*str) { if(str[0] == "(") <---- Warning { counter++; } else if (str[0]== ")") <---- Warning { counter--; } if (counter<0) { return 0; } str++; } if (counter!=0) { return 0; } return 1; } The warning i get is comparison between an int and a char. I tried to do the comparison (first char in the string vs. given char) also with strcmp like this: if (strcmp(str, ")")==0) { stuff } but it never goes in to 'stuff' even when the comparison (should) be correct. how should i do it? If str is a C string (null-terminated array of chars)