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C++ strlen() function




As evident from its name, strlen() is a function defined in the cstring header file, which gives us the total number of characters in a string, stored in a c-style char array.




Signature of strlen() function


size_t strlen(const char *str);)






Note :








strlen() example


In the upcoming example, we have initialized two char array with different strings. Next, we are calling strlen() function on each of these String objects to determine their length.

/* Program to find the total length of a String using strlen() */

#include<iostream>
#include<cstring>

using namespace std;

int main()
{
// First string 
char str1[10]= "01234567"; 	

cout<< "First string is : "<< str1 << "\n";
int length = strlen(str1);
cout<< "Length of first string is : " << length << "\n";


// Second string 
char str2[20]= "String Chapter";	

cout<< "Second string is : " << str2 << "\n";
length = strlen(str2);
cout<< "Length of second string is : " << length;

return 0;
}


Output is :


First String is 01234567
Length of first String is 8
Second String is String Chapter
Length of second String is 14


Program Analysis





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Finding length of an empty string using strlen()


In the upcoming example, we have finding length of an empty string, which is created but not initialized with any value.
// Program to find the length of an empty string


#include<iostream>
#include<cstring>

using namespace std;

int main()
{
char str1[10] = ""; // An empty string 
 
cout<< "The elements of the first string : " << str1 << "\n";
int length = strlen(str1);
cout<< "Length of the first string is : " << length << "\n";


// Another way to create a string 
char str2[] = {'A'}; // Not an empty string 

cout<< "The elements of the second string : " << str2 << "\n";
length = strlen(str2);
cout<< "Length of the second string is : " << length;

return 0;
}


Output is :


The elements of the first string :
Length of the first string is : 0
The elements of the second string : A
Length of the second tring is : 1


Program Analysis





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