十进制与36进制、64进制互转C语言程序

#include "header.h" int intTo64(char str[], const unsigned long long num) { char tmp_str[20] = {0}; static char digits[] ="0123456789abcdefghigklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$#"; /* 36进制数字的字符 */ unsigned int i = 10; int j = 0; unsigned long long tmp_num; tmp_num = num; printf("tmp_num = %lld\n", tmp_num); while(tmp_num) { tmp_str[--i] = digits[tmp_num % 64]; tmp_num /= 64; printf("tmp_num = %lld i = %d , tmp_str[%d] = %c\n", tmp_num, i, i, tmp_str[i]); } printf("tmp_str = %s\n", tmp_str); for(j=0;(str[j]=tmp_str[i])!='\0';j++,i++); /*将译出在工作数组中的字符串复制到s */ return 1; } int _64strToInt(unsigned long long *num, const char str[]) { int i = 0; unsigned long long tmp_num = 0; for (; str[i] != '\0';++i) { printf("str[i] = %c, tmp_num = %lld\n", str[i], tmp_num); if(str[i] == '$') { tmp_num = 64 * tmp_num + 62; } else if(str[i] == '#') { tmp_num = 64 * tmp_num + 63; } else if (str[i] > '9') { if(str[i] > 'A') { tmp_num = 64 * tmp_num + (36 + str[i] - 'A'); } else { tmp_num = 64 * tmp_num + (10 + str[i] - 'a'); } } else if(str[i] <= '9') { tmp_num = 64 * tmp_num + (str[i] - '0'); } } printf("tmp_num = %lld\n", tmp_num); *num = tmp_num; return 1; }