chapter 3 done

c03_data/escape.c

@@ -0,0 +1,15 @@
+/* escape.c - 使用转移序列 */
+#include <stdio.h>
+
+int main(void)
+{
+    float salary;
+
+    printf("\aEnter your desired monthly salary:");
+    printf("$______\b\b\b\b\b\b");
+    scanf("%f", &salary);
+    printf("\n\t$%.2f a month is $%.2f a year?", salary, salary * 12.0);
+    printf("\r Gee!\n");
+
+    return 0;
+}

c03_data/floaterr.c

@@ -0,0 +1,14 @@
+/* floaterr.c - 演示舍入错误 */
+#include <stdio.h>
+
+int main(void)
+{
+    float a, b;
+
+    b = 2.0e20 + 1.0;
+    a = b - 2.0e20;
+    
+    printf("%f \n", a);
+    
+    return 0;
+}

c03_data/showf_pt.c

@@ -0,0 +1,16 @@
+/* showf_pt.c - 以两种方式显示float类型的值 */
+#include <stdio.h>
+
+int main(void)
+{
+    float aboat = 32000.0;
+    double abet = 2.14e9;
+    long double dip = 5.32e-5;
+
+    printf("%f can be written %e\n", aboat, aboat);
+    printf("And it's %a in hexadecimal, powers of a notation\n", aboat);
+    printf("%f can be written %e\n", abet, abet);
+    printf("%Lf can be written %Le\n", dip, dip);
+    
+    return 0;
+}

c03_data/typesize.c

@@ -0,0 +1,15 @@
+/* typesize.c - 打印类型大小 */
+#include <stdio.h>
+
+int main(void)
+{
+    // %zd 用于打印size_t类型的值。sizeof(int) 返回一个 size_t 类型的值，表示 int 类型变量的大小（以字节为单位）。
+    printf("Type int has a size of %zd bytes.\n", sizeof(int));
+    printf("Type char has a size of %zd bytes.\n", sizeof(char));
+    printf("Type long has a size of %zd bytes.\n", sizeof(long));
+    printf("Type long long has a size of %zd bytes.\n", sizeof(long long));
+    printf("Type double has a size of %zd bytes.\n", sizeof(double));
+    printf("Type long double has a size of %zd bytes.\n", sizeof(long double));
+    
+    return 0;
+}