C语言将数字转化为字符串

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#include <stdio.h>

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#include <stdlib.h>

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char

*digitToAlpha (

int

val,

char

*buf, unsigned radix);

04

int

main(

int

argc,

char

*argv[])

05

{

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int

iNum = 55;

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char

strNum[10] =

""

;

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digitToAlpha(iNum,strNum,10);

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printf

(

"%s \n"

,strNum);

10

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system

(

"PAUSE"

);

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return

0;

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}

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/*

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功能:将数值转换为字符串

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参数:第一个是要转化的整数

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第二个是转化后的字符串

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第三个是要转化整数的基数，就是说如果基数是10，就可以直接转化，如果不是10，是其他值（2-36之间），则先把该整数转化为该基数的数后，再转化为字符串

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*/

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char

*digitToAlpha (

int

val,

char

*buf, unsigned radix)

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{ 

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char

*p;

/*pointer to traverse string */

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char

*firstdig;

/*pointer to first digit */

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char

temp;

/*temp char */

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unsigned digval;

/*value of digit */

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p = buf;

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if

(val<0)

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{ 

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/*negative, so output '-' and negate */

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*p++=

'-'

;

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val = (unsigned

long

)(-(

long

)val);

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}

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firstdig = p;

/*save pointer to first digit */

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do

{ 

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digval = (unsigned)(val%radix);

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val /=radix;

/*get next digit */

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/*convert to ascii and store */

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if

(digval >9)

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*p++= (

char

) (digval - 10 +

'a'

);

/*a letter */

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else

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*p++= (

char

) (digval +

'0'

);

/*a digit */

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}

while

(val >0);

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/*We now have the digit of the number in the buffer, but in reverse

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order. Thus we reverse them now. */

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*p-- =

'\0'

;

/*terminate string;p points to last digit */

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do

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{ 

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temp = *p;

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*p =*firstdig;

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*firstdig= temp;

/*swap *p and *firstdig */

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--p;

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++firstdig;

/*advance to next two digits */

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}

while

(firstdig <p);

/*repeat until halfway */

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return

buf;

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}