Question

I want a user defined function which is equivalent to strlen() function in C. In the below program it does the same function as strlen() but it has a limit to it. How can I make it count any length of text.

#include <stdio.h>
#include <conio.h>
void main()
{
    int len(char *);
    char s[20];
    int l;
    printf("Enter a string: ");
    gets(s);
    l=len(s);
    printf("length of string is =%d",l);
    getch();
}

int len(char *t)
{
    int count=0;
    while(*t!='\0')
    {
        count++;
        t++;
    }
    return(count);
}

Answer 1

I think your “limit” is because you use gets() on a buffer of 20 bytes. You will experience issues due to a buffer overflow. Exactly what happens when you do that is not entirely predictable.

If you fix that, I think your function will work as you expect it to. (Read the other people’s answers for insight on your length function.)