c printf翻译
https://www.sharetechnote.com/html/C_printf.html
正如您从“Hello World”程序中了解到的，printf（）是一个打印指定内容的函数。它使用起来非常简单，但是我们经常会困惑于需要指定什么样的格式才能得到我们想要的格式。
语法非常简单如下。int printf（const char*format，……）；
我看起来非常简单..但是您会看到一长串关于“*format”的描述，但是仅仅通读文档不会对您有多大帮助。我认为一堆没有太多的解释的例子会比冗长枯燥的写作要好。打印各种格式的数字打印非常大的数字打印二进制格式的数字打印科学格式的数字
#include
void main()
{
int d = 123;
float f = 123.45;
printf("%d\n",d) ;
printf("%8d\n",d) ;
printf("%08d\n",d) ;
printf("%x\n",d) ;
printf("0x%x\n",d) ;
printf("%#x\n",d) ;
printf("0x%8x\n",d);
printf("%#10x\n",d) ;
printf("0x%08x\n",d) ;
printf("%#010x\n",d) ;
printf("%#X\n",d) ;
printf("0x%8X\n",d) ;
printf("%#10X\n",d) ;
printf("0X%08X\n",d) ;
printf("%#010X\n",d) ;
printf("%f\n",f) ;
printf("%8.2f\n",f) ;
printf("%08.2f\n",f) ;
printf("%8.3f\n",f) ;
printf("%08.3f\n",f) ;
}
Result :------------------------------------
printf("%d",d) ==>123
printf("%8d",d) ==> 123
printf("%08d",d) ==>00000123
printf("%x",d) ==>7b
printf("0x%x",d) ==>0x7b
printf("%#x",d) ==>0x7b
printf("0x%8x",d) ==>0x 7b
printf("%#10x",d) ==> 0x7b
printf("0x%08x",d) ==>0x0000007b
printf("%#010x",d) ==>0x0000007b
printf("%#X",d) ==>0X7B
printf("0x%8X",d) ==>0x 7B
printf("%#10X",d) ==> 0X7B
printf("0X%08X",d) ==>0X0000007B
printf("%#010X",d) ==>0X0000007B
printf("%f",f) ==>123.449997
printf("%8.2f",f) ==> 123.45
printf("%08.2f",f) ==>00123.45
printf("%8.3f",f) ==> 123.450
printf("%08.3f",f) ==>0123.450
printing very big numbers
#include
#include
int main()
{
long xLong = 2147483647;
long long xLongLong = 9223372036854775807;
printf("%d\n",xLong);
printf("%ld\n",xLong);
printf("\n");
printf("%d\n",xLongLong);
printf("%ld\n",xLongLong);
printf("%lld",xLongLong);
return(0);
}
Result :------------------------------------
xLong in (%d) = 2147483647
xLong in (%ld) = 2147483647
xLongLong in (%d) = -1
xLongLong in (%ld) = -1
xLongLong in (%lld) = 9223372036854775807
printing a number in scientific format
#include
#include
#include
int main()
{
double xDouble = 2147483647.0;
printf("%f\n",xDouble);
printf("%e\n",xDouble);
printf("%E\n",xDouble);
printf("%g\n",xDouble);
printf("%G\n",xDouble);
return(0);
}
Result :------------------------------------
xDouble in (%f) = 2147483647.000000
xDouble in (%e) = 2.147484e+009
xDouble in (%E) = 2.147484E+009
xDouble in (%g) = 2.14748e+009
xDouble in (%G) = 2.14748E+009
Printing a number in binary format
There is no printf option or any other functions to print a number in a binary format. So you need to cr
eate such a function on your own. Refer to Printing in a Binary Format example.
没有printf选项或其他函数可以以二进制格式打印数字。因此，您需要自己创建一个这样的函数。请参考二进制格式打印示例。