The length of a string using pointers
Write a program to find the length of a string using pointers .
Examples:
Input : given_string = "geeksforgeeks" Output : length of the string = 13 Input : given_string = "coding" Output : length of the string = 6
Prerequisite : Pointer in C
Approach Used : In this program we make use of * operator. The * (asterisk) operator denotes the value of variable . The * operator at the time of declaration denotes that this is a pointer, otherwise it denotes the value of the memory location pointed by the pointer. In the below program, in string_length function we check if we reach the end of the string by checking for a null represented by ‘\0’ .
// C++ program to find length of string // using pointer arithmetic. #include <iostream> using namespace std; // function to find the length // of the string through pointers int string_length(char* given_string) { // variable to store the // length of the string int length = 0; while (*given_string != '\0') { length++; given_string++; } return length; } // Driver function int main() { // array to store the string char given_string[] = "geeksforgeeks"; cout << string_length(given_string); return 0; } |
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Output:
13
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