十六进制数转十进制

#include<stdio.h>int hexToDec(char *ch){int flag=0;int hex = 0;int n;while (*ch != '\0'){if (*ch<='9'&&*ch>='0'){flag = 1;n = *ch - '0';hex = hex * 16 + n;++ch;}else if (*ch<='f'&&*ch>='a'){flag = 1;n = *ch - 'a' + 10;hex = hex * 16 + n;++ch;}else if (*ch<='F'&&*ch>='A'){flag = 1;n = *ch - 'A' + 10;hex = hex * 16 + n;++ch;}else{if (flag)break;else++ch;}}return hex;}int main(){char hex[10];int decimal = 0;printf("Input a Hex numbers: ");gets(hex);decimal=hexToDec(hex);printf("The decimal value is : %d\n",decimal);return 0;}