string length program

1#include<stdio.h>
2
3int main()
4{
5    //let's assume the maximum string size as 100.
6    //initialize length as 0. Otherwise, it will take some garbage value.
7    char str[100];
8    int i, length = 0;
9    
10    //Get string input from the user
11    printf("Enter the string\n");
12    scanf("%s",str);
13    
14    /*Loop through each character 
15    and increment the length till we reach the null character. */
16    for(i = 0; str[i] != '\0'; i++)
17          length++;
18    
19    //print the length
20    printf("Length = %d\n",length);
21    
22    return 0;
23}
24