C Program to find the Armstrong Number. 2. Mock Interviews. i.e, "A" and "a" are treated as different characters. It returns a pointer to the first occurrence of Y in X or a null pointer if Y is not part of X. This is a guide to strcat() in C. fread () Function in C. The fread () function is the complementary of fwrite () function. 3.) The prototype of the strcat () is: char* strcat (char* destination, const char* source); The C99 standard adds the restrict qualifiers to the prototype: Below is the C implementation to show the use of strndup() function in C: Output. C program to Concatenate Two Strings without using strlcat () This program allows the user to enter two string values or two-character array. strcat - C++ Reference - cplusplus.com C - strtok function - Tutorials Point For strlcpy () that is simply the length of the source; for strlcat () that means the length of the destination (before concatenation) plus the length of the source. ]); The first argument is a pointer to the string from where we want to read the data. It accepts the same arguments as fwrite () function does. char * strcat ( char * destination, const char * source ); In this program, two strings "fresh2refresh" and "C tutorial" are concatenated using strcat . s2 "geeksforgeeks" We iterate via the string till null character '' I have made little bit modification to make it little easy. destination and source shall not overlap. This should not overlap the destination. Popular Course in this category ptr: it points to the block of memory which contains the data items to be written. Which means that this program: #include <stdio.h> #include <string.h> int main (void) { const char *s = "hello"; char *p = strchr (s, 'l'); *p = 'L'; return 0; } string.h is the header file required for string functions. c - How does strchr implementation work - Stack Overflow strncat_s, _strncat_s_l, wcsncat_s, _wcsncat_s_l, _mbsncat_s, _mbsncat_s_l Example #1 - Using strcat () Function As it is inbuild and predefined function it is mostly associated and defined in "string.h" header file. C library function - strcat() - Tutorials Point Insert the first string in the new string. It is the buffer to put the data in. To check for truncation, the programmer need only verify that the return value . The strcat() Function in C - C Programming Tutorial - OverIQ.com Let's create our own version of the strcat () function in C. Note: Below function only to understand the working of strcat. The sprintf() function accepts some parameter values that are defined as follows - str: It is the pointer to an array of char elements where the resulting string is stored. Parameters destination Pointer to the destination array, which should contain a C .