/* 范例：4-4 */
#include <stdio.h>
void main()
{
int a=5;
char *str = "abcd";
/* -,+,blank => 数值type */
printf("Flags = -,+,blank ........数值类型\n");
printf("#%+4d#(%%+4d)\n",10); /* #1.1 */
printf("#%+4d#(%%+4d)(<0)\n",-10); /* #1.2 */
printf("#%-4d#(%%-4d)\n",10); /* #1.3 */
printf("#%-4d#(%%-4d)(<0)\n",-10); /* #1.4 */
printf("#% 4d#(%% 4d)\n",10); /* #2 */
printf("#%+7.3g#(%%+7.3g)\n\n",10.2); /* #3 */
/* - => char type */
printf("Flags = -,+,blank ........字符(字符串)类型\n");
printf("#%5s#(%%5s)\n",str); /* #4.1 靠右(默认) */
printf("#%-5s#(%%-5s)\n",str); /* #4.2 靠左 */
printf("#%3c#(%%3c)\n",'A'); /* #5.1 靠右(默认) */
printf("#%-3c#(%%-3c)\n\n",'A'); /* #5.2 靠左 */
/* # => only number */
printf("Flags = # .......数值类型\n");
printf("#%10o#%8x#(%%10o,%%8x)\n",&a,&a); /* #6.1 */
printf("#%010o#%08x#(%%010o,%%08x)\n",&a,&a); /* #6.2 */
printf("#%#10o#%#8x#(%%#10o,%%#8x)\n\n",&a,&a); /* #6.3 */
printf("测试以#标识浮点数....当输入10.0时......\n");
printf("#%7.3g#(%%7.3g)\n",10.0); /* #7.1 */
printf("#%#7.0f#(%%#7.0f)\n",10.0); /* #7.2 */
printf("#%#7.2e#(%%#7.2e)\n",10.0); /* #7.3 */
printf("#%#7.3g#(%%#7.3g)\n",10.0); /* #7.4 */
getchar();
/* 混用Flags(-,+,blank,#) */
printf("Flags = -,+,blank,#混用 ...(输入10.2)......\n");
printf("#%+#7.4g#(%%+#7.4g)\n",10.2); /* #8.1 */
printf("#%+ 7.4g#(%%+ 7.4g)\n",10.2); /* #8.2 */
printf("#%# -+7.4g#(%%# -+7.4g)\n",10.2); /* #8.3 */
printf("#%-+# 7.4g#(%%-+# 7.4g)\n",10.2); /* #8.4 */
getchar();
}
程序执行结果：
Flags = -,+,blank ........数值类型
+10#(%+4d)
-10#(%+4d)(<0)
#10 #(%-4d)
#-10 #(%-4d)(<0)
10#(% 4d)
+10.2#(%+7.3g)
Flags = -,+,blank ........字符(字符串)类型
abcd#(%5s)
#abcd #(%-5s)
A#(%3c)
#A #(%-3c)
Flags = # .......数值类型
31177000# 64fe00#(%10o,%8x)
#0031177000#0064fe00#(%010o,%08x)
031177000#0x64fe00#(%#10o,%#8x)
测试以#标识浮点数....当输入10.0时......
10#(%7.3g)
10.#(%#7.0f)
#1.00e+01#(%#7.2e)
10.0#(%#7.3g)
Flags = -,+,blank,#混用 ...(输入10.2)......
+10.20#(%+#7.4g)
+10.2#(%+ 7.4g)
#+10.20 #(%# -+7.4g)
#+10.20 #(%-+# 7.4g)