博大精深库函数之

博大精深库函数之

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): %sn", i, buffer );_itoa( i, buffer, 16 );printf( "String of integer %d (radix 16): 0x%sn", i, buffer );_itoa( i, buffer, 2 );printf( "String of integer %d (radix 2): %sn", i, buffer );_ltoa( l, buffer, 16 );printf( "String of long int %ld (radix 16): 0x%sn", l,buffer );_ultoa( ul, buffer, 16 );printf( "String of unsigned long %lu (radix 16): 0x%sn", ul,buffer );
}

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();
*/