【摘】用C实现将数组转换为字符串

#include <stdio.h>
#include <stdlib.h>

char *digitToAlpha (int val, char *buf, unsigned radix);

int main(int argc, char *argv[])
{
  int iNum=1000;
  char strNum[10]="";
  digitToAlpha(iNum,strNum,10);
  printf("%s\n",strNum);
  
  system("PAUSE");    
  return 0;
}

/*
功能:将数值转换为字符串
参数:第一个是要转化的整数   
     第二个是转化后的字符串
     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
*/
char *digitToAlpha (int val, char *buf, unsigned radix) 
{ 
    char *p; /* pointer to traverse string */ 
    char *firstdig;/* pointer to first digit */ 
    char temp; /* temp char */ 
    unsigned digval; /* value of digit */ 

    p = buf; 

    if(val<0)
    { 
        /* negative, so output '-' and negate */ 
        *p++= '-'; 
        val = (unsigned long)(-(long)val); 
    } 

    firstdig = p;/* save pointer to first digit */ 

    do { 
        digval = (unsigned)(val%radix); 
        val /=radix; /* get next digit */ 

        /* convert to ascii and store */ 
        if (digval > 9) 
            *p++ = (char) (digval - 10 + 'a'); /* a letter */ 
        else 
            *p++ = (char) (digval + '0'); /* a digit */ 
    } while(val > 0); 

    /* We now have the digit of the number in the buffer, but in reverse 
    order. Thus we reverse them now. */ 

    *p-- = '\0'; /* terminate string; p points to last digit */ 

    do 
    { 
        temp = *p; 
        *p =*firstdig; 
        *firstdig= temp; /* swap *p and *firstdig */ 
        --p; 
        ++firstdig;     /* advance to next two digits */ 
    } while (firstdig < p); /* repeat until halfway */ 

    return buf; 
}

 

该程序的测试环境:

WinXPSP2,Dev C++ 4.9.9.2