As you know, the best way to find the length of a string is by using the strlen() function. However, in this example, we will find the length of a string manually.
Calculate Length of String without Using strlen() Function
#include <stdio.h>
int main() {
char s[] = "Programming is fun";
int i;
for (i = 0; s[i] != '\0'; ++i);
printf("Length of the string: %d", i);
return 0;
}
Output
Length of the string: 18
Here, using a for loop, we have iterated over characters of the string from i = 0 to until '\0' (null character) is encountered. In each iteration, the value of i is increased by 1.
When the loop ends, the length of the string will be stored in the i variable.
Note: Here, the array s[] has 19 elements. The last element s[18] is the null character '\0'. But our loop does not count this character as it terminates upon encountering it.