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Length of String without using strlen()

Programme:

#include <stdio.h>
int main()
{
    char s[1000],i;
    printf("Enter a string : ");
    scanf("%s",s);
 
 
    for(i=0; s[i]!='\0'; ++i);
 
    printf("Length of string : %d",i);
    return 0;
}

Output:

Enter a string : C programming rocks 
Length of string : 19