strcmp

C语言字符串操作函数总结

℡╲_俬逩灬. 提交于 2019-11-26 18:07:53
转载来源: https://blog.csdn.net/qq_33757398/article/details/81212618 字符串相关操作头文件: string.h 1.strcpy函数 原型: strcpy(str1,str2) ; 功能:将字符串str2 复制 到字符串str1中,并覆盖str1原始字符串,可以用来为字符串变量赋值 返回:str1 注意:   1)字符串str2会覆盖str1中的全部字符,   2)字符串str2的长度不能超过str1,   3) 拷贝原理:从首元素开始,遇到\0结束 int main(int argc, char const *argv[]) { char *str1 = "hello world"; char *str2; // 功能:把str1的内容拷贝到str2,参数为字符数组指针 strcpy(str2, str1); printf("str2 = %s\n", str2); char str3[15] = "hello\0 world"; char str4[15]; //拷贝原理:从首元素开始,遇到\0结束 strcpy(str4, str3); printf("str4 = %s\n", str4); return 0; } 输出 str2 = hello world str4 = hello 2.strncpy函数 原型:

Is there a JavaScript strcmp()?

删除回忆录丶 提交于 2019-11-26 17:38:57
Can anyone verify this for me? JavaScript does not have a version of strcmp(), so you have to write out something like: ( str1 < str2 ) ? -1 : ( str1 > str2 ? 1 : 0 ); newacct What about str1.localeCompare(str2) Javascript doesn't have it, as you point out. A quick search came up with: function strcmp ( str1, str2 ) { // http://kevin.vanzonneveld.net // + original by: Waldo Malqui Silva // + input by: Steve Hilder // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + revised by: gorthaur // * example 1: strcmp( 'waldo', 'owald' ); // * returns 1: 1 // * example 2: strcmp(

How to properly compare command-line arguments?

纵饮孤独 提交于 2019-11-26 17:15:50
问题 I am trying to write a C code which takes arguments in main; thus when I write some strings in cmd, the program doing somethings inside it. But I am doing something wrong and I can't find it. This is the code: #include <stdio.h> #include <stdlib.h> int main(int argc, char * argv[]){ //File name is main.c if(argc != 3) printf("Wrong!!!!!!!!!"); else if (argv[1] == "-s") girls(); //Prints "Girls" else if(argv[1] == "-k") boys(); //Prints "Boys" else printf("OMG!!"); } In the cmd; gcc -o gender

php 弱类型总结

吃可爱长大的小学妹 提交于 2019-11-26 17:05:14
php 弱类型总结 特别注意: md5(), json_encode(), array_search(), strcmp(), switch() ,in_array() 这几个容易涉及到php弱类型的函数 描述:php中有两种比较的符号 == 与 === === 在进行比较的时候,会先判断两种字符串的类型是否相等,再比较值是否相等 == 在进行比较的时候,会先将字符串类型转化成相同,再比较值 如果比较一个数字和字符串或者比较涉及到数字内容的字符串,则字符串会被转换成数值并且比较按照数值来进行 漏洞关键: 当一个字符串欸当作一个数值来取值,其结果和类型如下:如果该字符串没有包含'.','e','E'并且其数值值在整形的范围之内 该字符串被当作int来取值,其他所有情况下都被作为float来取值,该字符串的开始部分决定了它的值,如果该字符串以合法的数值开始,则使用该数值,否则其值为0 。 <?php 2 var_dump("admin"==0); //true 3 var_dump("1admin"==1); //true 4 var_dump("admin1"==1) //false 5 var_dump("admin1"==0) //true 6 var_dump("0e123456"=="0e4456789"); //true 7 ?> //上述代码可自行测试 1 观察上述代码,

What does strcmp() exactly return in C?

杀马特。学长 韩版系。学妹 提交于 2019-11-26 14:55:48
问题 I wrote this code in C: #include <stdio.h> #include <stdlib.h> #include <math.h> #include <string.h> int main() { char string1[20]; char string2[20]; strcpy(string1, "Heloooo"); strcpy(string2, "Helloo"); printf("%d", strcmp(string1, string2)); return(0); } Should console print value 1 or difference between ASCII values of o and \0 character i.e. 111? On this website, it is written that this should give out put 111, but when I run it on my laptop, it shows 1. Why? 回答1: From the cppreference

Is there a JavaScript strcmp()?

心已入冬 提交于 2019-11-26 04:47:08
问题 Can anyone verify this for me? JavaScript does not have a version of strcmp(), so you have to write out something like: ( str1 < str2 ) ? -1 : ( str1 > str2 ? 1 : 0 ); 回答1: What about str1.localeCompare(str2) 回答2: Javascript doesn't have it, as you point out. A quick search came up with: function strcmp ( str1, str2 ) { // http://kevin.vanzonneveld.net // + original by: Waldo Malqui Silva // + input by: Steve Hilder // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // +

strcmp on a line read with fgets

不羁岁月 提交于 2019-11-26 00:35:00
问题 I\'m trying to compare two strings. One stored in a file, the other retrieved from the user (stdin). Here is a sample program: int main() { char targetName[50]; fgets(targetName,50,stdin); char aName[] = \"bob\"; printf(\"%d\",strcmp(aName,targetName)); return 0; } In this program, strcmp returns a value of -1 when the input is \"bob\" . Why is this? I thought they should be equal. How can I get it so that they are? 回答1: strcmp is one of the few functions that has the reverse results of true

How do I properly compare strings?

半腔热情 提交于 2019-11-25 21:34:34
问题 I am trying to get a program to let a user enter a word or character, store it, and then print it until the user types it again, exiting the program. My code looks like this: #include <stdio.h> int main() { char input[40]; char check[40]; int i=0; printf(\"Hello!\\nPlease enter a word or character:\\n\"); gets(input); printf(\"I will now repeat this until you type it back to me.\\n\"); while (check != input) { printf(\"%s\\n\", input); gets(check); } printf(\"Good bye!\"); return 0; } The