十六进制转化

#include <string.h>

int main(void)

{

    char *shex = "000f000f";

    int idec =0;

    int i,mid;

    int len = strlen(shex);

    printf("%d
",len);

    if(len>8)

    return 0;

    mid = 0;

    idec =0;

    for(i =0;i<len;i++)

    {

        if(shex[i] >='0'&& shex[i]<='9')

            mid = shex[i]-'0';

        else if(shex[i]>='a'&& shex[i]<='f')

            mid= shex[i]-'a'+10;

        else if(shex[i]>='A'&&shex[i]<='F')

            mid = shex[i]-'A'+10;

        else

            return 0;
//32位一次取得4位
//当i等0时读取的是最高位，所以要右移7*2*2 6*2*2 5*2*2 4*2*2....

    mid <<= ((len-i-1)<<2);

        idec = idec+mid;

    }

    printf("%d
",idec);

    fprintf(stdout,"%d",idec);

return 1;

}