C Articles - Page 111 of 134

In the cstdlib library of C++, there are different functions for getting the absolute value except from abs. The abs are used basically for int type input in C, and int, long, long long in C++. The others are used for long, and long long type data etc. Let us see the usage of these functions.The abs() FunctionThis function is used for int type data. So this returns the absolute value of the given argument. The syntax is like below.int abs(int argument)Example#include #include #include using namespace std; main() {    int x = -145;    int y = 145;    cout

The wcstoll() function is used to convert the wide character string to long long integers. It sets the pointer to point to the first character after the last one. The syntax is like below.long long wcstoll(const wchar_t* str, wchar_t** str_end, int base)This function takes three arguments. These arguments are like below −str: This is the starting of a wide string.str_end: The str_end is set by the function to the next character, after the last valid character, if there is any character, otherwise null.base: This specifies the base. The base values can be of (0, 2, 3, …, 35, 36)This function ... Read More

Here we will see what is the use of ldexp() method in C or C++. This function returns any variable x raise to the power of exp value. This takes two arguments x and exp.The syntax is like below.float ldexp (float x, int exp) double ldexp (double x, int exp) long double ldexp (long double x, int exp) double ldexp (T x, int exp)Now let us see one example to get a better idea.Example#include #include using namespace std; int main() {    double a = 10, res;    int exp = 2;    res = ldexp(a, exp); // Finds a*(2^exp)    cout

Here we will see what are the differences between qsort() in C, and sort() in C++.The C provides qsort() function, that can be used for sorting an array. The function arguments and syntax is like below.void qsort(void *base, size_t num, size_t size, int (*comparator) (const void*, const void*));This function takes the base address of that array, the number of elements of that array. Size of each item in the array, and a comparator function.The C++ provides sort() function. This is present inside C++ STL. The arguments and syntax is like below.void sort(T first, T last, Compare c);Here the order of ... Read More

In C we have seen different format specifiers. Here we will see another format specifier called %p. This is used to print the pointer type data. Let us see the example to get a better idea.Example#include main() {    int x = 50;    int *ptr = &x;    printf("The address is: %p, the value is %d", ptr, *ptr); }OutputThe address is: 000000000022FE44, the value is 50

In C and C++, every character like 'A', 'b', '3', or '@' is stored as a number called its ASCII value. For example, 'A' is 65, and 'a' is 97. Given an integer like 97, we can convert it to its corresponding ASCII character which is 'a'. In this article, we will learn how to write a C and C++ program to convert an integer into its ASCII character. For example, we're given any integer from 0 to 127 (because the ASCII table contains 128 characters), and we need to convert it into its corresponding ASCII character: Input: 65 ... Read More

In C and C++, arrays can store multiple values of the same data type. This problem is about finding how many elements are present in a statically declared int[] array (not pointers or dynamically allocated arrays). We'll learn how to find the size of an int[] in both C and C++. Let's understand this with an example: //Example 1 input: int numbers[] = {10, 20, 30, 40, 50}; This array has 5 elements. Output: Number of elements: 5 //Example 2: Input: int values[] = {1, 2, 3}; This array has 3 elements. Output: Number of elements: 3 ... Read More

In this section we will see how to print a number 100 times in C. There are some constraints. We cannot use loops, recursions or macro expansions.To solve this problem we will use the setjump and longjump in C. The setjump() and longjump() is located at setjmp.h library. The syntax of these two functions are like below.Example#include #include jmp_buf buf; main() {    int x = 1;    setjmp(buf); //set the jump position using buf    printf("5"); // Prints a number    x++;    if (x

In this section we will see how to see the Host name and IP address of the local system in an easier way. We will write a C program to find the host name and IP.Some of the following functions are used. These functions have a different task. Let us see the functions and their tasks.FunctionDescriptiongethostname()It finds the standard host name for the local computer.gethostbyname()It finds the host information corresponding to a host name from host databaseiten_ntoa()It converts an IPv4 Internet network address into an ASCII string into dotted decimal format.Example#include #include #include #include #include ... Read More

Here we will see how to get the modulus of two floating or double type data in C. The modulus is basically finding the remainder. For this, we can use the remainder() function in C. The remainder() function is used to compute the floating point remainder of numerator/denominator.So the remainder(x, y) will be like below.remainder(x, y) = x – rquote * yThe rquote is the value of x/y. This is rounded towards the nearest integral value. This function takes two arguments of type double, float, long double, and returns the remainder of the same type, that was given as argument. ... Read More