C语言完美演绎4-4

/* 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)