A string is a one dimensional character array that is terminated by a null character. The length of a string is the number of characters in the string before the null character.
For example.
char str[] = “The sky is blue”; Number of characters in the above string = 15
A program to find the length of a string is given as follows.
#include<iostream> using namespace std; int main() { char str[] = "Apple"; int count = 0; while (str[count] != '\0') count++; cout<<"The string is "<<str<<endl; cout <<"The length of the string is "<<count<<endl; return 0; }
The string is Apple The length of the string is 5
In the above program, the count variable is incremented in a while loop until the null character is reached in the string. Finally the count variable holds the length of the string. This is given as follows.
while (str[count] != '\0') count++;
After the length of the string is obtained, it is displayed on screen. This is demonstrated by the following code snippet.
cout<<"The string is "<<str<<endl; cout<<"The length of the string is "<<count<<endl;
The length of the string can also be found by using the strlen() function. This is demonstrated in the following program.
#include<iostream> #include<string.h> using namespace std; int main() { char str[] = "Grapes are green"; int count = 0; cout<<"The string is "<<str<<endl; cout <<"The length of the string is "<<strlen(str); return 0; }
The string is Grapes are green The length of the string is 16