/in/foo.cc: In function 'int main()':
/in/foo.cc:16:25: error: 'strncpy_s' was not declared in this scope
    strncpy_s(b, a + i, 3);
                         ^
/in/foo.cc:18:41: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if (a[i] == a[len - i - 1]||a[i]=='('&&a[len-i-1]==')'||a[i]=='{'&&a[len-i-1]=='}'||a[i]=='['&&a[len-i-1]==']')
                                         ^
/in/foo.cc:18:69: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if (a[i] == a[len - i - 1]||a[i]=='('&&a[len-i-1]==')'||a[i]=='{'&&a[len-i-1]=='}'||a[i]=='['&&a[len-i-1]==']')
                                                                     ^
/in/foo.cc:18:97: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if (a[i] == a[len - i - 1]||a[i]=='('&&a[len-i-1]==')'||a[i]=='{'&&a[len-i-1]=='}'||a[i]=='['&&a[len-i-1]==']')
                                                                                                 ^
/in/foo.cc:22:31: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    else if (strcmp(b,"&lt")==0&& strcmp(c, "&gt") == 0|| strcmp(b, "&gt") == 0 && strcmp(c, "&lt") == 0 )      
                               ^