confuse about strlen

[chongado]

Hi there, I'm confusing about function strlen()

when I coding like this

char str[10];

str[0]='a';

when I show the result of strlen(str), It'll be 3.

why??? why it didn't be 1?

[asmallri]

You did not use any string functions to populate your string. If you want to do it manually then you need to terminate the string with a 0x00.

[chongado]

Thank you.

[Wayne_]

char str[10]; defines a char array which can hold upto 10 characters.

A string is series of chars terminated with a 0 NOT the char '0' but the value 0 which is the same as the char '\0' or null

Your code defines a char array and then sets the first value to 'a' the rest is random data and it just so happens that when you ran your code str[3] == '\0' which meant that strlen(str) returns the value 3.

As you have defined your char array as [10] you can only store a tring of upto 9 values for your string as the last char must contain the terminator '\0' or 0

[chongado]

[Wayne_]

Make sure you use the correct \

If you only want the one char in your string then you need to do

[chongado]

Hi There thank you so much I can do it ^^

'\0' lovely character