strncpy

Reversing words within a string

由 青春壹個敷衍的年華 提交于 2021-02-11 15:33:07
问题 I am to reverse the words within a string. I feel like I'm headed in the right direction. But I keep getting wonky output and cant help but think it has to do with my strncat() function. Do any of you see any issues with out I've decided to handle it. I'm open to suggestion on other ways to do it. int main() { int ch, ss=0, s=0; char x[3]; char *word, string1[100], string2[100], temp[100]; x[0]='y'; while(x[0]=='y'||x[0]=='Y') { printf("Enter a String: "); fgets(string1, 100, stdin); if

Using strncpy() where destination contains the source

由 混江龙づ霸主 提交于 2021-02-05 09:19:05
问题 I wrote a function to trim white space characters from a string in C. My concern is the last line in the trim() function below, where the source is contained in the destination. The test cases all turned out fine, along with some other testing. Can copying all or a portion of a string where the source and destination are in the same memory cause weird problems? Source code: #include <stdio.h> #include <string.h> void trim(char *line) { int i, len = strlen(line); char *ptr, whitespace[] = " \t

面向对象程序设计寒假作业3

由 拥有回忆 提交于 2020-02-16 09:07:50
这个作业属于哪个课程 https://edu.cnblogs.com/campus/fzu/2020OOP 这个作业要求在哪里 https://edu.cnblogs.com/campus/fzu/2020OOP/homework/10288 这个作业的目标 1. 继续完成编程题并制作测试 作业正文 1编程题 仓库地址 https://github.com/chen1357/homework 参考文献 https://blog.csdn.net/yjx4102/article/details/79319305 一、编程题 1.扩大数字范围 （1）增加负数范围 在“ 整数 ”运算过程中出现负数时不再报错，而是继续运算，同时输入与输出都可以是负数。同时新增加了“ 自然数 ”，若初始输入“ 自然数 ”，如果运算出现负数则报错。 初始值输入的判断进行了修改。 scanf("%s%s%s%s",a,b,c,d); if(strcmp(a,"整数")!=0&&strcmp(a,"自然数")!=0) { printf("输入有误,请重新输入\n"); continue; } 在运算过程中的判断也进行了修改。 if (sum<k && strcmp(a,"自然数")==0) printf("%s不能为负值,请重新输入\n",b); else sum -= k;; 并且在输出的函数中增加了这一部分。

traversing C string: get the last word of a string

由 有些话、适合烂在心里 提交于 2020-01-11 05:23:10
问题 how would you get the last word of a string, starting from the '\0' newline character to the rightmost space? For example, I could have something like this where str could be assigned a string: char str[80]; str = "my cat is yellow"; How would I get yellow? 回答1: Something like this: char *p = strrchr(str, ' '); if (p && *(p + 1)) printf("%s\n", p + 1); 回答2: I would use function strrchr() 回答3: In case you don't want to use 'strrchr' function, Here is the solution. i = 0; char *last_word; while

gcc-8 -Wstringop-truncation what is the good practice?

由 烂漫一生 提交于 2020-01-03 08:49:33
问题 GCC 8 added a -Wstringop-truncation warning. From https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82944 : The -Wstringop-truncation warning added in GCC 8.0 via r254630 for bug 81117 is specifically intended to highlight likely unintended uses of the strncpy function that truncate the terminating NUL charcter from the source string. An example of such a misuse given in the request is the following: char buf[2]; void test (const char* str) { strncpy (buf, str, strlen (str)); } I get the same

My Output has some weird symbols displaying

由 蹲街弑〆低调 提交于 2019-12-25 14:38:12
问题 I had to a coding for my class. The coding is about asking the user to type their Name, age and id. An then the program should for a passcode based on the first 6 letter in their name, their age and the first two letter in their student id. The problem is the a unidentified symbol (╠╠╠╠╠╠╠╠╠╠╠╠╠╠ )in the output. Can anyone tell me why it is there>? Then it should calculate and display the lenght of the passcode. Here is the code: #include <stdio.h> #include <string.h> void main(void) { char

strncpy question (C language)

由 为君一笑 提交于 2019-12-25 04:44:22
问题 I'm having difficulty with strncpy. I'm trying to split a string of 8 characters in two (the first 6 characters in one substring and then the remaining 2 characters in another). To illustrate the particular difficulty I have simplified my code to the following: include stdio.h include stdlib.h include string.h define MAXSIZE 100 struct word { char string[8]; char sub1[2]; char sub2[6]; }; typedef struct word Word; int main(void) { Word* p; p=(Word*)malloc(MAXSIZE*sizeof(Word)); if (p==NULL) {

strncpy copying more than the specified size

由 冷暖自知 提交于 2019-12-24 04:12:19
问题 I have the following sample code that mimics the code in the application. #include <iostream> #include <string.h> #include <cstring> #include <atlstr.h> using namespace std; void test(char *s, int size) { //s = ""; int lens = strlen(s); char *str1 = "(( State:0.000000 Std30c5 = State:T ) OR (( State:0.000000 Std30c6 = State:T ) OR (( State:0.000000 Std30c7 = State:T ) OR (( State:0.000000 Std30c8 = State:T ) OR (( State:0.000000 Std30c9 = State:T ) OR (( State:0.000000 Std30ca = State:T ) OR

strncpy copying more than the specified size

由 怎甘沉沦 提交于 2019-12-24 04:12:08
问题 I have the following sample code that mimics the code in the application. #include <iostream> #include <string.h> #include <cstring> #include <atlstr.h> using namespace std; void test(char *s, int size) { //s = ""; int lens = strlen(s); char *str1 = "(( State:0.000000 Std30c5 = State:T ) OR (( State:0.000000 Std30c6 = State:T ) OR (( State:0.000000 Std30c7 = State:T ) OR (( State:0.000000 Std30c8 = State:T ) OR (( State:0.000000 Std30c9 = State:T ) OR (( State:0.000000 Std30ca = State:T ) OR

c strncpy null terminated or not [duplicate]

由 妖精的绣舞 提交于 2019-12-22 18:45:12
问题 This question already has answers here : strncpy documentation question (6 answers) Closed 3 years ago . I am reading this document, it says: char *strncpy(char *destination, const char *source, size_t num); Copy characters from string Copies the first num characters of source to destination . If the end of the source C string (which is signaled by a null-character) is found before num characters have been copied, destination is padded with zeros until a total of num characters have been
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