strcat

matlab字符串函数

匿名 (未验证) 提交于 2019-12-03 00:22:01
字符串操作函数: 将数字转换为字符串,由于主要接触的还是在科学计算方面,使用较多的还是在多变量批量命名上。类似的函数还有int2str,mat2str,str2double等,功能与之类似 deblank() strcat(): 把多个字符串水平方向依次连接 lower()和upper() :可以把字符串的所有字母转为小写和大写格式 strcat(): 把多个字符串水平方向依次连接 strvcat(): 字符串按竖直方向连接 strjust(S,mode): strcmp(): 比较两个字符串,完全相同时返回逻辑变量1,否则为0 strcmpi(): 忽略字母大小写的方式比较两个字符串 文章来源: matlab字符串函数

Oracle各种连接函数总结

白昼怎懂夜的黑 提交于 2019-12-02 18:09:44
1.前言 Oracle可用连接函数会介绍以下几个 Oracle列转行函数 Listagg() strcat() wmsys.wm_concat() 2.Oracle列转行函数 Listagg() 2.1最基础的用法: LISTAGG(XXX,XXX) WITHIN GROUP( ORDER BY XXX) 用法就像聚合函数一样,通过Group by语句,把每个Group的一个字段,拼接起来。 其中LISTAGG函数第一个参数为要拼接的字段,第二个参数为用什么字符串进行连接 eg : listagg(city,’,’) 后面GROUP()中为对连接之后的行数据按什么字段进行排序 eg : order by city with temp as( select 'China' nation ,'Guangzhou' city from dual union all select 'China' nation ,'Shanghai' city from dual union all select 'China' nation ,'Beijing' city from dual union all select 'USA' nation ,'New York' city from dual union all select 'USA' nation ,'Bostom' city from

strcpy and strcat cause problems sometimes

允我心安 提交于 2019-12-02 14:08:42
问题 hello I have a code like the one below char *str ; strcpy(str, "\t<"); strcat(str, time); strcat(str, ">["); strcat(str, user); strcat(str, "]"); strcat(str, "("); strcat(str, baseName); strcat(str, ") $ "); printf("\String is now: %s\n", str); This code seems working but when I use XCode analyse function, it says "Function call argument is an uninitialized value" and also it sometimes causes my program crash.. when I remove it, then it works fine... Whats wrong with that? Thanks 回答1: strcpy

strcpy and strcat cause problems sometimes

可紊 提交于 2019-12-02 07:20:10
hello I have a code like the one below char *str ; strcpy(str, "\t<"); strcat(str, time); strcat(str, ">["); strcat(str, user); strcat(str, "]"); strcat(str, "("); strcat(str, baseName); strcat(str, ") $ "); printf("\String is now: %s\n", str); This code seems working but when I use XCode analyse function, it says "Function call argument is an uninitialized value" and also it sometimes causes my program crash.. when I remove it, then it works fine... Whats wrong with that? Thanks strcpy and strcat are used to copy and concatenate strings to an allocated char array. Since str in not initilized

Writing more characters than malloced. Why does it not fail?

泄露秘密 提交于 2019-12-02 03:15:53
问题 Why does the following work and not throw some kind of segmentation fault? char *path = "/usr/bin/"; char *random = "012"; // path + random + \0 // so its malloc(13), but I get 16 bytes due to memory alignment (im on 32bit) newPath = (char *) malloc(strlen(path) + strlen(random) + 1); strcat(newPath, path); strcat(newPath, "random"); // newPath is now: "/usr/bin/012\0" which makes 13 characters. However, if I add strcat(newPath, "RANDOMBUNNIES"); shouldn't this call fail, because strcat uses

结对编程

核能气质少年 提交于 2019-12-02 02:21:47
1.GITHUB项目地址https://github.com/920690572/wc 项目成员:3117008742刘霍翔 3117008746石林峰 项目要求 使用 -n 参数控制生成题目的个数,例如 Myapp.exe -n 10 将生成10个题目。 使用 -r 参数控制题目中数值(自然数、真分数和真分数分母)的范围,例如 Myapp.exe -r 10 将生成10以内(不包括10)的四则运算题目。该参数可以设置为1或其他自然数。该参数必须给定,否则程序报错并给出帮助信息。 生成的题目中计算过程不能产生负数,也就是说算术表达式中如果存在形如e1− e2的子表达式,那么e1≥ e2。 生成的题目中如果存在形如e1÷ e2的子表达式,那么 其结果应是真分数 。 每道题目中出现的运算符个数不超过3个。 程序一次运行生成的题目不能重复, 即任何两道题目不能通过有限次交换+和×左右的算术表达式变换为同一道题目 。例如,23 + 45 = 和45 + 23 = 是重复的题目,6 × 8 = 和8 × 6 = 也是重复的题目。 3+(2+1)和1+2+3这两个题目是重复的,由于+是左结合的,1+2+3等价于(1+2)+3,也就是3+(1+2),也就是3+(2+1)。但是1+2+3和3+2+1是不重复的两道题,因为1+2+3等价于(1+2)+3,而3+2+1等价于(3+2)+1

Writing more characters than malloced. Why does it not fail?

孤者浪人 提交于 2019-12-02 01:30:24
Why does the following work and not throw some kind of segmentation fault? char *path = "/usr/bin/"; char *random = "012"; // path + random + \0 // so its malloc(13), but I get 16 bytes due to memory alignment (im on 32bit) newPath = (char *) malloc(strlen(path) + strlen(random) + 1); strcat(newPath, path); strcat(newPath, "random"); // newPath is now: "/usr/bin/012\0" which makes 13 characters. However, if I add strcat(newPath, "RANDOMBUNNIES"); shouldn't this call fail, because strcat uses more memory than allocated? Consequently, shouldn't free(newPath) also fail because it tries to free 16

结对项目(唐崇珂——谭艺)

孤街醉人 提交于 2019-12-01 13:35:13
一、Github与源代码 https://github.com/wuchengttt/hello-world 源代码 主函数 int main() {  //检测是否存在这两个文件,如果没有就新建 FILE *fp; fp = fopen("Exercises.txt", "w+"); fclose(fp); fp = fopen("Answers.txt", "w+"); fclose(fp); int range = 0; printf("请输入产生几以内的数字:"); scanf_s("%d", &range); printf("\n请输入产生多少个运算表达式:"); scanf_s("%d", &num); int right1 = 0; int wrong1 = 0; char(*result)[LENGTH] = (char(*)[LENGTH])malloc(sizeof(char)*LENGTH*num); int i; for (i = 1; i <= num; i++) {//随机生成四个数字 //char expArr[2];//定义生成的题目 int a = (int)(random(range));//分子 int b = (int)(random(range));//分母 int c = (int)(random(range));//另一个分子 int

How to use strcat() function?

纵然是瞬间 提交于 2019-12-01 10:50:10
I am very new in C language. I was trying to use strcat function. #include <stdio.h> #include <string.h> int main(int argc, const char *argv[]) { char s1[] = "12345"; char s2[] = "abcde"; strcat(s1, s2); puts(s1); puts(s2); return 0; } This one ran normally,but #include <stdio.h> #include <string.h> int main(int argc, const char *argv[]) { char* s1 = "12345"; char* s2 = "abcde"; strcat(s1, s2); puts(s1); puts(s2); return 0; } the last one failed to return a result. Why did the two different ways of declaration return different results in the strcat function. Thanks in advance. In C the