fix bugs in the code

Author: Qinghao Shi

APIs_Storage/BufferedBlockDevice/main.cpp

@@ -16,7 +16,7 @@
 
 #include "BufferedBlockDevice.h"
 #include "HeapBlockDevice.h"
-#include <stdlib.h>
+#include <cstdio>
 
 int main()
 {
@@ -29,7 +29,7 @@ int main()
 	int err = buf_bd.init();
 
 	uint8_t buf[8];
-	for (uint i = 0; i < sizeof(buf); i++) {
+	for (uint8_t i = 0; i < sizeof(buf); i++) {
 		 buf[i] = i;
 	}
 

Tutorials_UsingAPIs/Flow-Control-Busy-Wait-Button/main.cpp

@@ -1,6 +1,6 @@
 #include "mbed.h"
 
-DigitalIn button(SW1); // Change to match your board
+DigitalIn button(BUTTON1); // Change to match your board
 DigitalOut led(LED1);
 
 #define BUTTON_PRESS 0

Tutorials_UsingAPIs/Flow-Control-Interrupt-Button/main.cpp

@@ -1,6 +1,6 @@
 #include "mbed.h"
 
-InterruptIn button(SW1);
+InterruptIn button(BUTTON1);
 DigitalOut led(LED1);
 DigitalOut heartbeat(LED2);