In the following C program we are counting the number of characters in a given String to find out and display its length on console. Upon execution of this program, the user would be asked to enter a string, then the program would count the chars and would display the length of input string as output.
C Program – finding length of a String without using standard library function strlen
/* C Program to find the length of a String without
* using any standard library function
*/
#include <stdio.h>
int main()
{
/* Here we are taking a char array of size
* 100 which means this array can hold a string
* of 100 chars. You can change this as per requirement
*/
char str[100],i;
printf("Enter a string: \n");
scanf("%s",str);
// '\0' represents end of String
for(i=0; str[i]!='\0'; ++i);
printf("\nLength of input string: %d",i);
return 0;
}
Output:
