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#include <iostream> #include <string.h> #include <cmath> using namespace std; #define MAX 50 int countDigit(long long n){ return floor(log10(n)+1); } char* hexToDec(char hex[]){ int r, total=0; int length = strlen(hex); for(int i=0;i<hex[i]!='\0';i++){ length--; if(hex[i]>='0' && hex[i] <='9'){ r = hex[i] - 48; }else if(hex[i]>='a' && hex[i]<='f'){ r = hex[i] - 87; }else if(hex[i]>='A' && hex[i]<='F'){ r = hex[i] - 55; } total += r*pow(16, length); } int l = countDigit(total); char *result = new char[l]; for(int i=0;i<l;i++){ result[i] = total%10 + '0'; total/=10; } return result; } void print(char* num){ cout << "Result : "; for(int i=strlen(num)-1;i>=0;i--){ cout << num[i]; } cout << endl; } int main(){ char num[MAX]; cout << "Enter a hexadecimal number : "; while(cin >> num){ char* res = hexToDec(num); print(res); free(res); cout << "Enter a hexadecimal number : "; } return 0; }
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