tmpnam() function in C

The tmpnam() function is a special function which is declared inside “stdio.h” header file. It generates a different temporary file name each time it is...

isgraph() C library function

The C library function isgraph() checks whether a character is a graphic character or not. Characters that have graphical representation are known are graphic charac...

strftime() function in C/C++

strftime() is a function in C which is used to format date and time. It comes under the header file time.h, which also contains a structure named struct tm which is u...

exec family of functions in C

The exec family of functions replaces the current running process with a new process. It can be used to run a C program by using another C program. It comes under the...

Write one line functions for strcat() and strcmp()

Recursion can be used to do both tasks in one line. Below are one line implementations for stracat() and strcmp(). /* my_strcat(dest, src) copies data of sr...

C Library math.h functions

The math.h header defines various mathematical functions and one macro. All the functions available in this library take double as an argument and return double as th...

C function to Swap strings

Let us consider the below program. #include<stdio.h> void swap(char *str1, char *str2) {   char *temp = str1;   str1 = str2; ...

strdup() and strndup() functions in C/C++

The strdup() and strndup() functions are used to duplicate a string. strdup() : Syntax : char *strdup(const char *s); This function returns a pointer to a null-termi...

strspn() function in C

The strspn() function returns the length of the initial substring of the string pointed to by str1 that is made up of only those character contained in the string poi...

isalpha() and isdigit() functions in C/C++ with example

isalpha(c) is a function in C which can be used to check if passed character is an alphabet or not. It returns a non-zero value if it’s an alphabet else it ret...