Length of a C-Style String

You can use the strlen(str) function to find the length of a null-terminated C-style string.

Write a program that uses a function to calculate the length of a null-terminated C-style string (without using the strlen function) by iterating until the null character is reached.

Answer

#include <iostream>

// Function to calculate the length of a C-style string
int stringLength(char *str) {
    int length = 0;
    while (str[length] != '\0') {
        ++length;
    }
    return length;
}

int main() {
    char cString[] = "Hello, World!";

    // Call the custom function to calculate the length
    int length = stringLength(cString);

    // Output the length of the string
    std::cout << "Length of the string: " << length << std::endl;
}

The length is gotten by iterating through characters from the starting point passed into stringLength and incrementing the length until the null-character ('\0') is reached.