C Articles - Page 129 of 134

The function iswblank() is used to check that the passed wide character is blank or not. It is basically a space character and it also considers tab character(\t). This function is declared in “ctype.h” header file in C language and “cctype”” header file in C++ language.Here is the syntax of isblank() in C++ language, int iswblank(wint_t char);Here is an example of iswblank() in C++ language, Example Live Demo#include #include using namespace std; int main() {    wchar_t s[] = L"The space between words.";    int i = 0;    int count = 0;    while(s[i]) {       ... Read More

The function isblank() is used to check that the passed character is blank or not. It is basically a space character and it also considers tab character(\t). This function is declared in “ctype.h” header file in C language and “cctype”” header file in C++ language.Here is the syntax of isblank() in C++ language, int isblank(int char);Here is an example of isblank() in C++ language, Example Live Demo#include #include using namespace std; int main() {    string s = "The space between words. ";    int i = 0;    int count = 0;    while(s[i]) {       ... Read More

The size of void pointer varies system to system. If the system is 16-bit, size of void pointer is 2 bytes. If the system is 32-bit, size of void pointer is 4 bytes. If the system is 64-bit, size of void pointer is 8 bytes. Finding Size of a Void Pointer  To find the size of a void pointer, you can use the sizeof() operator that accepts a data type, variable name, or any value and returns its size. In this case, you need to pass the name of the void pointer. Syntax Following is the basic syntax of void ... Read More

fgets()The function fgets() is used to read the string till the new line character. It checks array bound and it is safe too.Here is the syntax of fgets() in C language, char *fgets(char *string, int value, FILE *stream)Here, string − This is a pointer to the array of char.value − The number of characters to be read.stream − This is a pointer to a file object.Here is an example of fgets() in C language, Example Live Demo#include #define FUNC 8 int main() {    char b[FUNC];    fgets(b, FUNC, stdin);    printf("The string is: %s", b);    return 0; }OutputThe ... Read More

The return value of main() function shows how the program exited. The normal exit of program is represented by zero return value. If the code has errors, fault etc., it will be terminated by non-zero value.In C++ language, the main() function can be left without return value. By default, it will return zero.Here is the syntax of main() function in C language, int main() {    ….    return 0; }Here is an example of main() function in C language, Example Live Demo#include int main() {    int a = 10;    char b = 'S';    float c = ... Read More

The datatype size_t is unsigned integral type. It represents the size of any object in bytes and returned by sizeof operator. It is used for array indexing and counting. It can never be negative. The return type of strcspn, strlen functions is size_t.Here is the syntax of size_t in C language, const size_t var_name;Here, var_name − This the name of variable.Here is an example of size_t in C language, Example Live Demo#include #include #include int main(void) {    const size_t x = 150;    int a[x];    for (size_t i = 0;i < x; ++i)    a[i] = ... Read More

The function modf() is used to split the passed argument in integer and fraction. It is declared in “math.h” header file for the mathematical calculations. It returns the fractional value of passed argument.Here is the syntax of modf() in C language, double modf(double value, double *integral_pointer);Here, value − The value which splits into integer and fraction.integral_pointer − It points the integer part of argument after splitting.Here is an example of modf() in C language, Example Live Demo#include #include int main () {    double val, x, res;    val = 28.856;    res = modf(val, &x);    printf("Integral part of val ... Read More

The function isgreater() is used to check that the first argument is greater than the second one or not. It is declared in “math.h” header file in C language. It returns true, if successful, otherwise false.Here is the syntax of isgreater().bool isgreater(value1 , value2);Here, value1 − This is the first argument which will be checked with value2.value2 − This is the second argument which is used to check value1 that is greater or not.Here is an example of isgreater().Example Live Demo#include #include using namespace std; int main() {    int val1 = 28;    int val2 = 8;    bool result; ... Read More

rand()The function rand() is used to generate the pseudo random number. It returns an integer value and its range is from 0 to rand_max i.e 32767.Here is the syntax of rand() in C language, int rand(void);Here is an example of rand() in C language, Example Live Demo#include #include int main() {    printf("%d", rand());    printf("%d", rand());    return 0; }Output1804289383 846930886srand()The function srand() is used to initialize the generated pseudo random number by rand() function. It does not return anything.Here is the syntax of srand() in C language, void srand(unsigned int number);Here is an example of srand() in C ... Read More

strdup() The function strdup() is used to duplicate a string. It returns a pointer to a null-terminated byte string. Syntax Here is the syntax of strdup() in C language, char *strdup(const char *string); Example Here is an example of strdup() in C language. #include #include int main() {  char *str = "Helloworld";  char *result;  result = strdup(str);  printf("The string : %s", result);  return 0; } Output The string : Helloworld strndup() The function strndup works similarly to the function strndup(). This function duplicates the string at most size bytes i.e. the given size in the function. It also returns ... Read More