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I've a C++ program to reverse a string.
Its showing linker error. please help me debug it

char* st(const char *);

int main()
{
char *str="abcdefgh", *abc="\0";
strcpy(abc,st(str));...

thank you :)

code below is showing lvalue required error. why is it? how can it be corrected?

char c[10];
c='!';