/* 范例：4-3 */
#include <stdio.h>
void main()
{
int a = 123;
double ff = 0.01234567890;
char *str = "123456";
/* int(%d,%i,%o,%u,%x) */
/* only width */
printf("int(d,i,o,u,x)........(ex: a=123)\n");
printf("#%2d#%3d#%4d#(%%2d,%%3d,%%4d)\n",a,a,a);/* #1 */
printf("#%02d#%03d#%04d#(%%02d,%%03d,%%04d)\n",a,a,a);
/* #2 */
printf("#%*d#%0*d#(%%*d,%%0*d传入5,a,5,a)\n\n",5,a,5,a);
/* #3 */
/*标识符o,u,x,X设定方法一样 */
printf("#%08o#%08u#%08X#(%%08o,%%08u,%%08X)\n", \ &a,&a,&a);
/* #4 */
/* float,double(%f,%e,%g) */
printf("Floating point(f,e,g).....(ex: ff=0.01234567890)\n");
printf("#%16f#(%%16f)\n",ff); /* #5 */
printf("#%16.9f#(%%16.9f)\n",ff); /* #6 */
printf("#%16.9e#(%%16.9e)\n",ff); /* #7 */
printf("#%16.9g#(%%16.9g)\n",ff); /* #8 */
printf("#%.9f#(%%.9f)\n",ff); /* #9 */
printf("#%*.*e#(%%*.*f传入16,3,ff)\n\n",16,3,ff); /* #10 */
/* char(%c) */
printf("char(c)...........(ex: 'a','b')\n");
printf("#%5c#%05.3c#\n\n",'a','b'); /* #11 */
/* char* 字符串(%s) */
printf("char * 字符串(s)...(ex: str=\"123456\")\n");
printf("#1234567890....对齐用\n");
printf("#%10s#(%%10s)\n",str); /* #12 */
printf("#%10.3s#(%%10.3s)\n",str); /* #13 */
printf("#%5.3s#(%%5.3s)\n",str); /* #14 */
printf("#%.*s#(%%.*s输入3,str)\n",3,str); /* #15 */
getchar();
}
程序执行结果：
int(d,i,o,u,x)........(ex: a=123)
#123#123# 123#(%2d,%3d,%4d)
#123#123#0123#(%02d,%03d,%04d)
123#00123#(%*d,%0*d传入5,a,5,a)
#31177000#06618624#0064FE00#(%08o,%08u,%08X)
Floating point(f,e,g).....(ex: ff=0.01234567890)
0.012346#(%16f)
0.012345679#(%16.9f)
1.234567890e-02#(%16.9e)
0.0123456789#(%16.9g)
#0.012345679#(%.9f)
1.235e-02#(%*.*f传入16,3,ff)
char(c)...........(ex: 'a','b')
a# b#
char * 字符串(s)...(ex: str="123456")
#1234567890....对齐用
123456#(%10s)
123#(%10.3s)
123#(%5.3s)
#123#(%.*s传入3,str)