update integer overflow

src/Others/3.3.2_width_overflow.c

@@ -0,0 +1,18 @@
+#include<stdio.h>
+void main() {
+    int l;  
+    short s;
+    char c;
+
+    l = 0xabcddcba;
+    s = l;
+    c = l;
+
+    printf("宽度溢出\n");
+    printf("l = 0x%x (%d bits)\n", l, sizeof(l) * 8);
+    printf("s = 0x%x (%d bits)\n", s, sizeof(s) * 8);
+    printf("c = 0x%x (%d bits)\n", c, sizeof(c) * 8);
+
+    printf("整型提升\n");
+    printf("s + c = 0x%x (%d bits)\n", s+c, sizeof(s+c) * 8);
+}