Will the strlen() function below get called just once (with the value stored for further comparisons); or is it going to be called every time the comparison is performed?
for (i = ...
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I have a void *, call it data, whose length I know, but is not null terminated. I make a call like this snprintf(line, sizeof(line), "%*s", n, (const char*)data) where ... |
I'm wondering if there would be any merit in trying to code a strlen function to find the \0 sequence in parallel. If so, what should such a function take into ... |
I have typed a program, but i get an error message.
pls help me on this
#include <stdio.h>
#include <string.h>
int print_strlen(char s[]);
main()
{
char s[20];
...
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Why is strlen() not checking for NULL?
if I do strlen(NULL), it seg faults.
Trying to understand the rationale behind it (if any).
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i'm writing a small tool written in c and met on a segmentation fault which i don't know currently how to resolve. Running in GDB gives me the following hint:
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I have the following piece of code in C:
char a[55] = "hello";
size_t length = strlen(a);
char b[length];
strncpy(b,a,length);
size_t length2 = strlen(b);
printf("%d\n", length); // output ...
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Close Markus, it never tries to access s[-1], although you are right about the condition causing the problem. strlen(s) - 1 for s == "" == -1 Therefore the condition is i <= -1 Since i is initialised to 0 on a 32 bit system that allows i to have the range 0 - 2147483647 until i final wraps and causes ... |
jacob navia #include #include #define H 0x8080808080808080ULL #define L 0x0101010101010101ULL H and L are used only within myStrlen; I'd declare them inside the function. Yes, I know macro definitions aren't scoped that way, but it's useful for documentation. size_t myStrlen(char *s) { [snip] } > #ifdef TEST int main(int argc,char ... |
As far as I know, sizeof() operator gives the size of a certain variable or type. The fact that it is an operator means that it is applied at compile-time and not runtime. Since you passed a 3-byte wide var, it gives 3. On the other hand, strlen gives the length of a string. A string must be NULL terminated (i.e., ... |
11. strlen bytes.com"Imran" wrote in message news:cfems0$mfo$1@ns1.fe.internet.bosch.com...[color=blue] > Hello All > > I have a 2D array, > > char arr[4][10] = {"Hello","world","test","hi"}; > > how can find the strlen of the array > > am expecting array length as "4" > > Thanks in Adv[/color] Your expected answer indicates that you are really trying to determine the first dimension of a ... |
#include #include #include int main(int argc, char *argv[]) { char *s = "hello strlen"; printf("%s has %d chars.\n", s, strlen(s)); //the above strlen function execute correctly char *msg1 = "abcdefghijklmnopqrstuvwxyz"; char buf[10]; strcpy(buf, msg1); printf("[%s] length: %d\n", msg1, strlen(msg1)); //but the above statement will throw a runtime os exception system("PAUSE"); return 0; } I don't know what occus ... |
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Hi, we have strNcpy, strNcmp etc, (small n obviously), but why not in strlen ? the question is i am having some buffer strlen(buff); what happen if buff is not containing '\0', (i have try some prog. it will crashing/printing junk chars, using valgrind its showing invalid mem read etc..) so what i think is i made something simillar to above ... |
howachen@gmail.com wrote: from many books said, to use strlen(), you need to include , but i found the following program work, why? > #include > using namespace std; > int main() { > char *c = "test"; > cout< } > > i know it is from , so this mean the books are wrong now? In your ... |
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Hi guys the other day i posted a question regarding inputing data into a string. After much research my code has changed lots and i have got to this point Code: #include #include #include int input; int q =0; int p; int d=0; int main(){ char sortingarray[5]; printf("Please enter a 4 digit number\n"); fgets ( sortingarray, 5, stdin ... |
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I'm using mac, myself, and I think the actual function doing the strlen is "__dyld_strlen". It has the following assembly dump: Code: 0x00007fff5fc22e90 <__dyld_strlen+0>: pxor %xmm0,%xmm0 0x00007fff5fc22e94 <__dyld_strlen+4>: mov %edi,%ecx 0x00007fff5fc22e96 <__dyld_strlen+6>: mov %rdi,%rdx 0x00007fff5fc22e99 <__dyld_strlen+9>: and $0xfffffffffffffff0,%rdi 0x00007fff5fc22e9d <__dyld_strlen+13>: or $0xffffffffffffffff,%eax 0x00007fff5fc22ea0 <__dyld_strlen+16>: pcmpeqb (%rdi),%xmm0 0x00007fff5fc22ea4 <__dyld_strlen+20>: and $0xf,%ecx 0x00007fff5fc22ea7 <__dyld_strlen+23>: shl %cl,%eax 0x00007fff5fc22ea9 <__dyld_strlen+25>: pmovmskb %xmm0,%ecx 0x00007fff5fc22ead <__dyld_strlen+29>: and ... |
#include #include #include int mystrlen(char *s){ int i; for(i = 0; s[i] != '\0'; i++){ } return i; } int main () { int i; char *p1 = "Use malloc()"; char *p2; if (NULL == (p2 = malloc(mystrlen(p1) + 1))){ printf("Not enough memory!\n"); return 1; } for (i = 0; i <= mystrlen(p1); i++) p2[i] = p1[i]; printf("%s\n",p2); ... |
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long time; /* know C? */ Unprecedented performance: Nothing ever ran this slow before. Any sufficiently advanced bug is indistinguishable from a feature. Real Programmers confuse Halloween and Christmas, because dec 25 == oct 31. The best way to accelerate an IBM is at 9.8 m/s/s. recursion (re - cur' - zhun) n. 1. (see recursion) |
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28. strlen cboard.cprogramming.comAs far as I can tell, C compilers won't stop you from assigning an unsigned number to a signed variable like len, but that doesn't mean there is no problem in doing that. The integer could overflow if the string were long enough (say 2^15 in length). If this is a problem, use unsigned longs or size_ts. |
29. strlen help cboard.cprogramming.comHi I have aslight problem regarding the strlen function. I was told that if you had an array that can hold 20 characters, and you asked the user to input a string, and they entered a string of 7 characters, that the program would print out 'rubbish' due to the string being so small. I was told I could counter this ... |
int cc; ii = 0; for(cc = 0; cc < 1; cc--) { // infinite loop if(fgets(aa[ii], LINE_SZ, stdin) == NULL) exit(0); if(strlen(aa[ii]) > 80) { fprintf(stderr, "Bad input.\n"); } else if(aa[ii][0] == '<') { // pop if(ii == 0) { fprintf(stderr, "Empty stack.\n"); } else { printf(aa[ii-1]); } } else if(aa[ii][0] == '>') { // push if(ii == stackSize) { ... |
31. strlen() cboard.cprogramming.com |
Ok, i have a string im printing to the screen with say, co-ordinates of X = 240 Y = 136 I want it so if the text is over say, 29 characters, then scrol it left for every time i enter a character... I thought, o a simple if statment saying if strlen(string) > 29 { blah blah, but it is ... |
strlen(S) will give you the length of the string. It can also be interpreted as the index of where the null value is located. Therefore, S+strlen(S) will give you a pointer pointing to the null termination and since that pointer is thrown into another strlen() the result will be 0 because it found the null termination immediately. So the result is ... |
34. strlen() cboard.cprogramming.comI tried in the c++ forum but no one apparantly knows what to do. strlen() requires a const char, as in... strlen( const char ); so, what do you do if you have a char* ? is there a way to get the text the pointer points to in to a const char? This is what I am trying to do... ... |
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36. Strlen cboard.cprogramming.com |
Is there a way to count the characters in a string without using strlen? I was trying to write my own string length function by using the array....Do I have to initialize the char array? Can someone just give me a hint please??? Here are part of the code I have so far, very very ugly.......I don't even know what am ... |
program is to let user input series of words and when user inputs word of length 4 characters, it stops. It should sort the words alphabetically, so if a group of same-length words is longest/shortest, it outputs longest as last alphabetically, shortest as first alphabetically. My code is not pulling the longest word correctly. What is the problem here???? Code: #include ... |
Why is it that strlen returns the number of chars currently in the string, and not the actual declared size of the array? When I first started using strlen, I loved this feature, since when used to control a loop it avoids useless iteration. Now I want something that will tell me the declared size of the array, regardless of how ... |
Code: #include #include #include #define SIZE 81 #define SIZEANS 81 int main(void) { FILE *fp, *outFp; char *status, *status2; int times; int looptimes; struct { char numberofItems[3]; char answersToQuestions[50]; } answerKey[SIZEANS]; struct { char studentID[7]; char answers[50]; } answer[SIZE]; int y, szAns[] = {0,3,51}; int i, sz[] = {0,6,51}; char buff[1024]; char buff2[1024]; char insert[1024]; int x = ... |
Hi All, This is my partial program called index.cgi.c: Code: #include #include #include #include "wishnottoreveal.h" #define DEBUG int main(int argc, char *argv[]){ char loginId[11]; char *loginIdStr = NULL; char *data = NULL; char *result = NULL; char c; int i,j; #ifdef DEBUG printf("Content-type: text/plain\n\n"); printf("DEBUG MODE\n"); fflush(NULL); #endif removeCookie(); data = getenv("HTTP_COOKIE"); #ifdef DEBUG printf("Disply all the cookies: ... |
this code does nothing except creating file and let user key in some string into it. the enter() function is for user enter the string and the generate() function will count how many character in the created file (contact.txt). the loop in enter() will continue until user enter "anqi". In generate(), strlen return a value that not as how many char ... |
I am having some difficulty locating the actual function strlen in my system. (SuSE 9.0) I wrote a simple function that accomplishes the same thing and i want to compare to the standard. when i view /usr/include/string.h I can only find a declaration similar to this: extern size_t strlen (__const char *__s) __THROW __attribute_pure__; Anyone know where I can find the ... |
44. strlen forums.devshed.com |
#include #include #include #include "port.h" /* * strstr - find first occurrence of wanted in s */ char * /* found string, or NULL if none */ strstr(s, wanted) CONST char *s; CONST char *wanted; { register CONST char *scan; register SIZET len; register char firstc; extern int strncmp(); extern SIZET strlen(const char *); /* * The odd ... |
#include int strlenA(const char *str) { const char *eostr = str; while ( *eostr++ ); return eostr - str; } int strlenB(const char *str) { const char *eostr = str; while ( *eostr ) { eostr++; } return eostr - str; } int main() { char str[] = "rahul"; printf("strlenA(\"%s\") = %d\n", str, strlenA(str)); printf("strlenB(\"%s\") = %d\n", str, strlenB(str)); return ... |
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