Data commit

Task/Empty-string/C/empty-string.c

@@ -0,0 +1,19 @@
+#include <string.h>
+
+/* ... */
+
+/* assign an empty string */
+const char *str = "";
+
+/* to test a null string */
+if (str) { ... }
+
+/* to test if string is empty */
+if (str[0] == '\0') { ... }
+
+/* or equivalently use strlen function
+   strlen will seg fault on NULL pointer, so check first */
+if ( (str == NULL) || (strlen(str) == 0)) { ... }
+
+/* or compare to a known empty string, same thing. "== 0" means strings are equal */
+if (strcmp(str, "") == 0) { ... }