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[每日C语言」printf()函数(1)

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printf()函数为IO函数,请求print()打印变量的指令取决于变量的类型。诸如,我们在打印int型的时候需使用%d符号,在打印字符的时候需使用%c符号。这些符号被称之为转换说明,它指定了如何把数据转换成可显示的形式。下面就来看看ANSI C标准为print()提供的各种转换说明。

转换说明%a 浮点数、十六进制数字和p-计数法%A 浮点数、十六进制数字和p-计数法

double num = 512.0;

printf("num is %a\n",num);

printf("num is %A\n", num);

结果:

num is 0x1.0000000000000p+9

num is 0X1.0000000000000P+9

%c 一个字符

char a = 'a';

printf("a is %c\n", a);

结果:

a is a

%d 有符号十进制整数%i 有符号十进制整数

int b = 512;

printf("b is %d\n", b);

printf("b is %i\n", b);

结果:

b is 512

b is 512

%e 浮点数、e-计数法%e 浮点数、e-计数法

double c = 512.0;

printf("c is %e\n", c);

printf("c is %E\n", c);

结果:

c is 5.120000e+02

c is 5.120000E+02

% f 浮点数 十进制计数法

double d = 512.0;

printf("d is %f\n", d);

结果:

d is 512.000000

%G 根据数据的不同自动选择%f或者%e。%e格式在指数小于-4或者大于等于精度。%g 根据数据的不同自动选择%f或者%e。%e格式在指数小于-4或者大于等于精度。

double e = 512.0;

printf("e is %g\n", e);

printf("e is %G\n", e);

结果:

e is 512

e is 512

%o 无符号八进制整数

int f = 8;

printf("f is %o\n", f);

结果:

f is 10

%p 指针

int g = 10;

int * h = &g;

printf("h adr is %p\n", h);

printf("h is %d\n", *h);

结果:

h adr is 0133FB68

h is 10

%s 字符串

char i[] = "i love you";

printf("%s\n", i);

结果:

i love you

%u 无符号十进制整数

int j = 256;

printf("j is %u\n", j);

结果:

j is 256

%x 使用十六进制数字0f的无符号十六进制整数%X 使用十六进制数字0F的无符号十六进制整数

int k = 16;

printf("k is %x\n", k);

printf("k is %X\n", k);

结果:

k is 10

k is 10

%% 打印一个百分号

float m = 0.04;

printf("m is %d %%\n", int(m*100));

结果:

m is 4 %

#include <stdio.h>

int main()

{

double num = 512.0;

printf("num is %a\n",num);

printf("num is %A\n", num);

char a = 'a';

printf("a is %c\n", a);

int b = 512;

printf("b is %d\n", b);

printf("b is %i\n", b);

double c = 512.0;

printf("c is %e\n", c);

printf("c is %E\n", c);

double d = 512.0;

printf("d is %f\n", d);

double e = 512.0;

printf("e is %g\n", e);

printf("e is %G\n", e);

int f = 8;

printf("f is %o\n", f);

int g = 10;

int * h = &g;

printf("h adr is %p\n", h);

printf("h is %d\n", *h);

char i[] = "i love you";

printf("%s\n", i);

int j = 256;

printf("j is %u\n", j);

int k = 16;

printf("k is %x\n", k);

printf("k is %X\n", k);

float m = 0.04;

printf("m is %d %%\n", int(m*100));

return 0;

}

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标签: #c语言浮点数转换成十六进制 #浮点数转换16进制 c语言 #c语言百分号什么意思