The string is actually a one-dimensional array of characters which is terminated by a null character '\0'. Thus a null-terminated string contains the characters that comprise the string followed by a null.
To find the length of a string we need to loop and count all words in the loop until the ‘\0’ character is matched.
For example
Input −naman
Output − string length is 5
Explanation − we need to iterate over each index of the string until reach the end of string means ‘\0’ which is the null character.
Example
#include <stdio.h>
#include<string.h>
int main() {
char string1[]={"naman"};
int i=0, length;
while(string1[i] !='\0') {
i++;
}
length=i;
printf(" string length is %d",length);
return 0;
}Output
string length is 5