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Task/String-case/C/string-case.c

@@ -0,0 +1,36 @@
+/* Demonstrate toupper and tolower for
+   standard C strings.
+   This does not work for multibyte character sets. */
+#include <ctype.h>
+#include <stdio.h>
+
+/* upper-cases s in place */
+void str_toupper(char *s)
+{
+    while(*s)
+    {
+        *s=toupper(*s);
+        s++;
+    }
+}
+
+
+/* lower-cases s in place */
+void str_tolower(char *s)
+{
+    while(*s)
+    {
+        *s=tolower(*s);
+        s++;
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    char t[255]="alphaBETA";
+    str_toupper(t);
+    printf("uppercase: %s\n", t);
+    str_tolower(t);
+    printf("lowercase: %s\n", t);
+    return 0;
+}