藍橋杯：基礎練習 十六進位轉十進位

// 基礎練習 十六進位轉十進位#include <stdio.h>#include <string.h>#include <math.h>int main(){char strHex[8];int i = 0, len = 0, temp = 0;__int64 nDec = 0;gets(strHex);len = strlen(strHex);for (i = 0; strHex[i] != '\0'; ++i){switch(strHex[i]){case 'A': temp = 10; break;case 'B': temp = 11; break;case 'C': temp = 12; break;case 'D': temp = 13; break;case 'E': temp = 14; break;case 'F': temp = 15; break;default: temp = strHex[i]-'0'; break;}nDec += (temp*pow(16,len-1-i));}printf("%I64d",nDec);return 0;}