https://code-reference.com/ 2026-06-21T05:29:11+02:00 https://code-reference.com/ https://code-reference.com/ttps://code-reference.com/lib/tpl/dokuwiki/images/favicon.ico text/html 2024-02-16T01:06:14+02:00 https://code-reference.com/c/string.h/memchr?rev=1708041974&do=diff void *memchr(const void *str, int c, size_t n); memchr finds the firs occurrence of a character and return a pointer to it. #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <string.h> int main( void ) { char string[] = "Find the firs occurrence of a character and count it !"; if( memchr(string,'o',strlen(string)) == NULL ) { printf( "Cant find o character\n" ); } else { printf( "found character o at po… text/html 2024-02-16T01:06:15+02:00 https://code-reference.com/c/string.h/memcmp?rev=1708041975&do=diff int memcmp(const void *str1, const void *str2, size_t n); check the size of a string and string2 and return a value less 0 string1 lesser than string2 equal 0 string1 equal string2 greater 0 string1 greater than string2 #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <string.h> #define MAX 42 int main ( void ) { char string1[MAX]="Teststring"; char string2[MAX]="test"; int i; i = memcmp ( string1, string2,… text/html 2024-02-16T01:06:15+02:00 https://code-reference.com/c/string.h/memcpy?rev=1708041975&do=diff memcpy void *memcpy(void *str1, const void *str2, size_t n); Copy a string into another variable important here is to give the size of the string #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <string.h> int main ( void ) { char source[20]="Test 1234 ! :D"; char dest[20]; memcpy (dest,source,strlen(source)+1); printf ("Value of Destination is %s\n",dest); return 0; } text/html 2024-02-16T01:06:15+02:00 https://code-reference.com/c/string.h/memmove?rev=1708041975&do=diff memmove #include <stdlib.h> void *memmove(void *str1, const void *str2, size_t n); str1: target memory block (at least size bytes in size) str2: source memory block (at least size bytes in size) n: number of bytes to be copied (The type size_t corresponds usually int)) text/html 2024-02-16T01:06:15+02:00 https://code-reference.com/c/string.h/memset?rev=1708041975&do=diff memset #include <stdlib.h> void *memset(void *str, int c, size_t n); memset Fill / overwrite memory region with certain characters str = Target memory block /c string c = value byte that is used to overwrite n = number of chars to be copied text/html 2013-02-17T03:15:08+02:00 https://code-reference.com/c/string.h/strcat?rev=1361067308&do=diff #include <stdlib.h> char *strcat(char *str1, const char *str2); description of strcat The strcat function concatenates two strings. str1 = target string to be added to source str2 = source string to copied, including '\ 0' at the end of destination. null byte of destination will be overwritten. text/html 2015-01-10T19:10:59+02:00 https://code-reference.com/c/string.h/strchr?rev=1420913459&do=diff char *strchr(const char *str, int c); strchr finds the first occurrence of a character and return a pointer to it. C Sourcecode Example /* * strchr c example code * http://code-reference.com/c/string.h/strchr */ #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <string.h> int main( void ) { char *ptr; char string[] = "Find the first occurrence of a character and count it !"; if( strchr(string,'o') == NULL ) printf(… text/html 2024-02-16T01:06:15+02:00 https://code-reference.com/c/string.h/strcmp?rev=1708041975&do=diff #include <string.h> //#include <windows.h> /* uncomment this for Windows */ int strcmp (const char *s1, const char *s) Description strcmp Compares 2 C strings. If both strings are identical, the return value of strcmp is 0. If the string s1 less than s2, the return value is less than 0, and s1 is greater than s2, then the return value greater than 0 text/html 2024-02-16T01:06:14+02:00 https://code-reference.com/c/string.h/strcoll?rev=1708041974&do=diff int strcoll(const char *str1, const char *str2); strcoll compares 2 strings C Sourcecode Example /* * strcoll c example code * http://code-reference.com/c/string.h/strcoll */ #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <string.h> int main( void ) { char string[] = "am i the same"; char string2[] = "i whant to be the same"; char string3[] = "am i the same"; if( strcoll(string,string2) != 0 ) printf( "%s… text/html 2014-04-05T05:04:09+02:00 https://code-reference.com/c/string.h/strcpy?rev=1396667049&do=diff #include <string.h> char *strcpy(char *str1, const char *str2); Description strcpy copy a c string pointed by str2 into the array pointed by str1 including the terminating null character. strcpy C Example Code /* * strcpy c example code * http://code-reference.com/c/string.h/strcpy */ #include <stdio.h> /* including standard library */ #include <string.h> int main( void ) { char string[] = "copy me"; /* the size of the array is calculated automatically */ char string2[20]; … text/html 2024-02-16T01:06:15+02:00 https://code-reference.com/c/string.h/strcspn?rev=1708041975&do=diff #include <string.h> //#include <windows.h> /* uncomment this for Windows */ size_t strcspn(const char *str1, const char *str2); Description strcspn find the first occurrence of any character in str2 strcspn C Example Code /* * strcspn c example code * http://code-reference.com/c/string.h/strcspn */ #include <stdio.h> #include <string.h> #include <stdlib.h> /* for strlen */ int main ( void ) { char string[] = "te=st@code-reference.com"; char search_keys[] = "?! ,$%:;&/()="; … text/html 2013-02-17T00:49:50+02:00 https://code-reference.com/c/string.h/strerror?rev=1361058590&do=diff #include <string.h> //#include <windows.h> /* uncomment this for Windows */ char *strerror(int errnum); Description returns a pointer to a string that describes the error code passed in the argument errnum compile this example with the compiler flag -lm text/html 2014-04-05T05:08:20+02:00 https://code-reference.com/c/string.h/strlen?rev=1396667300&do=diff size_t strlen(const char *str); calculates the size of a char array C Sourcecode Example #include <stdio.h> #include <string.h> int main (void) { char ss[20] = "hello world"; int length = strlen(ss); int i; printf ("strlen is %i\n", length); for ( i = 0; i < length ; ++ i ) printf ("iam at char count %i\n", i); return 0; } text/html 2013-09-04T17:20:16+02:00 https://code-reference.com/c/string.h/strncat?rev=1378308016&do=diff #include <stdlib.h> char *strncat(char *dest, const char *src, size_t n); appends the src string to the dest string, overwriting the null byte ('\0') at the end of dest, and then adds a terminating null byte. The strings may not overlap, and the dest string must have enough space for the result. text/html 2013-02-17T01:55:52+02:00 https://code-reference.com/c/string.h/strncmp?rev=1361062552&do=diff #include <stdlib.h> int strncmp(const char *str1, const char *str2, size_t n); The strcmp() function compares the two strings s1 and s2. It returns an integer less than, equal to, or greater than zero if s1 is found, respectively, to be less than, to match, or be greater than s2. The strncmp() function is similar, except it only compares the first (at most) n characters of s1 and s2. text/html 2013-02-17T01:55:28+02:00 https://code-reference.com/c/string.h/strncpy?rev=1361062528&do=diff #include <string.h> char *strncpy(char *str1, const char *str2, size_t n); Copy a given Number of Chars into another string. #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <string.h> #define MAX 5 int main( void ) { char string1[MAX]; char string2[]="Test 12345"; strncpy(string1, string2, MAX); /* Copy MAX chars from string2 to string1 */ string1[MAX]='\0'; /* Terminate String */ … text/html 2013-02-17T01:24:56+02:00 https://code-reference.com/c/string.h/strpbrk?rev=1361060696&do=diff #include <string.h> char *strpbrk(char *s1, const char *s2); finds the first occurrence of a character. #include <stdio.h> /* including standard library */ //#include <windows.h> /* uncomment this for Windows */ #include <string.h> int main( void ) { char string1[]="You can help with your experience to improve this page"; char string2[]="help"; printf("So please %s\n", strpbrk( string1, string2 ) ); return 0; } text/html 2013-02-17T01:47:43+02:00 https://code-reference.com/c/string.h/strrchr?rev=1361062063&do=diff strrchr #include <stdlib.h> char *strrchr(const char *str, int c); description of strrchr strrchr () is a string function that finds the last occurrence of a character in a string. As a result, the pointer comes to this character or the null pointer if this character is not found. text/html 2013-02-17T02:13:47+02:00 https://code-reference.com/c/string.h/strspn?rev=1361063627&do=diff #include <stdlib.h> size_t strspn(const char *str1, const char *str2); strspn C Sourcecode Example /* * strspn example code * http://code-reference.com/c/string.h/strspn */ #include <stdio.h> #include <string.h> int main( void ) { const char string[] = "the answer is 42"; int pos = strspn(string, "the answer = 42"); printf("different char at position :%d\n",pos+1); return 0; } text/html 2013-02-17T02:32:06+02:00 https://code-reference.com/c/string.h/strstr?rev=1361064726&do=diff #include <stdlib.h> char *strstr(const char *str1, const char *str2); strstr C Sourcecode Example /* * strstr example code * http://code-reference.com/c/string.h/strstr */ #include <stdio.h> #include <string.h> int main ( void ) { char str[] = "42 is the result or ? but what was the question"; char *ptr; // set the Pointer ptr to "or ?" ptr = strstr (str, "or ?"); // replace the text with "yes" strncpy (ptr, "yes", 3); printf("%s\n",str); return 0; } text/html 2013-02-23T18:10:45+02:00 https://code-reference.com/c/string.h/strtok?rev=1361639445&do=diff #include <stdlib.h> char *strtok(char *str1, const char *str2); description of strtok Function strtok breaks a string (str1) into individual strings based on the so-called token. The string is separated by one delimiter (str2). “str2” may contain multiple tokens, e.g. str2 = “\ n” (ie separation in space, comma, New Line, Point). text/html 2013-02-17T03:02:49+02:00 https://code-reference.com/c/string.h/strxfrm?rev=1361066569&do=diff #include <stdlib.h> size_t strxfrm(char *str1, const char *str2, size_t n); description of strxfrm The function strxfrm () transforms a null-terminated C string according to local settings. Thus the string can be safely compared using strcmp () with another. The transformed string is stored in a new string.