都是自己整理的一些库函数给初学者使用
首先介绍一个把整型数字转换成字符串 _itoa( 整型数字, 字符串名 , 等进制基数(保证了整型数字要按照这个进制转换成字符串表示)) (字面意思int to a字符串~我觉得这么记比较好记嘿嘿)
#include <stdlib.h>
#include <stdio.h>
void main( void )
{
char buffer[20];
int i = 3445;
long l = -344115L;
unsigned long ul = 1234567890UL;
_itoa( i, buffer, 10 );
printf( "String of integer %d (radix 10): %s\n", i, buffer );
_itoa( i, buffer, 16 );
printf( "String of integer %d (radix 16): 0x%s\n", i, buffer );
_itoa( i, buffer, 2 );
printf( "String of integer %d (radix 2): %s\n", i, buffer );
_ltoa( l, buffer, 16 );
printf( "String of long int %ld (radix 16): 0x%s\n", l,
buffer );
_ultoa( ul, buffer, 16 );
printf( "String of unsigned long %lu (radix 16): 0x%s\n", ul,
buffer );
}
上述输出结果是
String of integer 3445 (radix 10): 3445 _itoa();
String of integer 3445 (radix 16): 0xd75 _itoa();
String of integer 3445 (radix 2): 110101110101 _itoa();
String of long int -344115 (radix 16): 0xfffabfcd _ltoa();
String of unsigned long 1234567890 (radix 16): 0x499602d2 _ultoa();
*/
要注意前后意思的对应,细节很重要。