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#include 
   
    #include 
    
     #include 
     
      #include 
      
       int main(){        int i, j, len, sum = 0;        char s[1000];                          //store the 0x number you input        printf("Please input the number you want to chang form 0x(..) to int\n");        scanf("%s", s);        len = strlen(s);                       //the length of s        if((s[0] == '0') && (s[1] == 'x' || s[1] == 'X'))   //check the prefix        {                for(i = len-1; i >= 2; i--)                {                        int tmp = 1;                        //store the 16^x                        for(j = len-1; j > i; j--)                        {                                tmp *= 16;                        }                        if(s[i] >= '0' && s[i] <= '9')                        {                                sum += tmp * (s[i] - '0');                        }                        else if(s[i] >= 'a' && s[i] <= 'f')                        {                                sum += tmp * (s[i] - 'a' + 10);                        }                        else if(s[i] >= 'A' && s[i] <= 'F')                        {                                sum += tmp * (s[i] - 'A' + 10);                        }                        else                        {                                printf("Your input is invalid!\n");                                return 0;                        }                }                printf("The result is %d\n", sum);        }        else        {                printf("Your input is invalid!\n");        }        return 0;}
      
     
    
   

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