why the string is getting altered after strcat()?

Question

this is the source code

int main()
{
    char str[]=\"dance\";
    char str1[]=\"hello\";
    char str2[]=\"abcd\";
    strcat(str1,str2);
    printf(\"%s\",s         


        

Answer 1

I got it...

as I have not given the size of str1 , both str1 and str are present in the memory one after another

like

h e l l o \0 d a n c e

so when I concatenate str1 and str2 following thing happens...

a replaces \0
b replaces d
c replaces a
d replaces n
\0 replaces c

and hence str is altered