strcmp

PHP's documentation on this function is a bit sparse and I have read that this function compares ASCII values so... echo strcmp('hello', 'hello'); //outputs 0 as expected - strings are equal. echo '<hr />'; echo strcmp('Hello', 'hello'); //outputs -32, a negative number is expected as //uppercase H has a lower ASCII value than lowercase h. echo '<hr />'; echo strcmp('60', '100'); //outputs 5. The last example is confusing me. I don't understand why it is outputting a positive number. ASCII Value of 0 = 48 ASCII Value of 1 = 49 ASCII Value of 6 = 54 Total ASCII value of '60' = (54 + 48) = 102

题目链接：https://vjudge.net/problem/POJ-2947 题意：转换题意后就是已知m个同余方程，求n个变量。 思路： 　　值得学习的是这个模板里消元用到lcm的那一块。注意题目输出的答案在[3,9]之间。 AC代码： #include<cstdio> #include<algorithm> #include<cstring> #include<cmath> #include<cstdlib> using namespace std; const int maxn=305; int n,m,a[maxn][maxn],x[maxn]; char s1[10],s2[10]; int gcd(int a,int b){ return b?gcd(b,a%b):a; } int lcm(int a,int b){ return a/gcd(a,b)*b; //先除后乘 } // 高斯消元法解方程组(Gauss-Jordan elimination).( //-1表示无解，0表示唯一解，大于0表示无穷解，并返回自由变元的个数) //有equ个方程，var个变元。增广矩阵行数为equ,分别为0到equ-1,列数为var+1,分别为0到var. int Gauss(int equ,int var){ int k,max_r,col=0,ta,tb,LCM,temp;

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: The comparision operators < <= > >= can be applied for strings as well. So why do we need special function for string comparision: strcmp ? 回答1: Because there are several variations: Depending on the function, the answer to these questions vary: Is it case sensitive? ( strcmp vs strcasecmp , strnatcmp vs strnatcasecmp ) Depends it depend on the locale? ( strcoll does) Can I specify a collation? ( strcoll is affected by setlocale ) Additionaly, the comparison operators also give true or false . strcmp gives an integer so it can encode

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: Seems strncmp is usually recommended than strcmp , what are the advantages? I think it could be related to security. If this is the case, is it still applicable if one of the input string is known to be literal constant, like "LiteralString" ? UPDATE: I mean under the same user scenario where whole strings need to be compared, and strncmp can be used as below. I am wondering it makes sense or not. strncmp ( inputString , "LiternalString" , strlen ( "LiternalString" )); 回答1: The problem with strcmp is that sometimes, if by mistake,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I was trying to replicate the strcmp from c in python.I typed the former program and it worked but the latter seems to work as well?please explain the latter one.I only expected == to work but >,< seems to wokrk.How does python know that by <,> i mean the length of string without using len() def strcmp(str1,str2): if(len(str1) == len(str2)): return 0 if(len(str1) > len(str2)): return 1 if(len(str1) < len(str2)): return -1 print strcmp("ashsih","aapam") vs def strcmp(str1,str2): if(str1 == str2): return 0 if(str1 > str2): return 1 if(str1 <

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: This question already has an answer here: C Strings Comparison with Equal Sign 5 answers I have got two strings (string literals in that case), say char * name = "Fotis" ; char * second_name = "Fotis" ; and I have two ways to compare them, which are both giving me an accurate result. The first one is with the equality operator ( == ), likewise: if ( name == second_name ) printf ( "Great success!\n" ); and the second one is through the strcmp function available in string.h : if ( strcmp ( name , second_name ) == 0 ) printf ( "Great

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This question already has an answer here: strcmp on a line read with fgets 6 answers #include <stdio.h> #include <math.h> #include <string.h> #define size 7 int computeN(char s1[]) { int n=-1; if(strcmp(s1, "black") == 0) { n = 0; } else if (strcmp(s1, "brown") == 0) { n = 10; } else if (strcmp(s1, "red") == 0) { n = 20; } else if (strcmp(s1, "orange") == 0) { n = 30; } else if (strcmp(s1, "yellow") == 0) { n = 40; } else if (strcmp(s1, "green") == 0) { n = 50; } else if (strcmp(s1, "blue") == 0) { n = 60; } else if (strcmp(s1, "violet") ==

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I appear to be getting a segmentation fault somewhere with the strcmp function. I'm still very new to C and I can't see why it gives me the error. int linear_probe(htable h, char *item, int k){ int p; int step = 1; do { p = (k + step++) % h->capacity; }while(h->keys[p] != NULL && strcmp(h->keys[p], item) != 0); return p; } gdb: Program received signal SIGSEGV, Segmentation fault. 0x0000003a8e331856 in __strcmp_ssse3 () from /lib64/libc.so.6 (gdb) frame 1 #1 0x0000000000400ea6 in linear_probe (h=0x603010, item=0x7fffffffde00 "ksjojf", k=

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: The following piece of code behaves differently in 32-bit and 64-bit operating systems. char *cat = "v,a"; if (strcmp(cat, ",") == 1) ... The above condition is true in 32-bit but false in 64-bit. I wonder why this is different? Both 32-bit and 64-bit OS are Linux (Fedora). 回答1: The strcmp() function is only defined to return a negative value if argument 1 precedes argument 2, zero if they're identical, or a positive value if argument 1 follows argument 2. There is no guarantee of any sort that the value returned will be +1 or -1 at any time

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to compile the following very very simple piece of source code: #include // #include // using namespace std; class Helper { public: int cStringsAreEqual(const char *s1, const char *s2) { return stricmp(s1, s2); } }; ... but I am getting the following error message: g++ error: ‘stricmp’ was not declared in this scope However when I use strcmp() instead of stricmp() then everything is fine! What can be wrong here? Shouldn't stricmp() be allowed when strcmp() is allowed? Sureley, this all could be written in a much better way