C program to find the length of a string

#include <stdio.h>
#include <conio.h>
int main()
{
char str[100], i = 0, length;
clrscr();
printf("\n Enter the string : ");
gets(str)
while(str[i] != '\0')
 i++;
length = i;
printf("\n The length of the string is : %d", length);
getch()
return 0;
}