/*

請輸入一個16進位制數 : FF

這個數的10進位制是 : 255

Press any key to continue

*/

#include <stdio.h>

unsigned Hex2Dec(char hex[]) {

unsigned i,num = 0;

for(i = 0; hex[i]; ++i) {

if(hex[i] >= "a" && hex[i] <= "f")

num = 16 * num + hex[i] - "a" + 10;

else if(hex[i] >= "A" && hex[i] <= "F")

num = 16 * num + hex[i] - "A" + 10;

else if(hex[i] >= "0" && hex[i] <= "9")

num = 16 * num + hex[i] - "0";

}

return num;

}

int main() {

char s[9];

printf("請輸入一個16進位制數 : ");

scanf("%s",s);

printf("這個數的10進位制是 : %u\n",Hex2Dec(s));

return 0;

}