#include iostream using namespace std double power (double x, int n) int main int 1. int value=0 char ch cout Enter an 8 bit binary number for (i=7:i >=0:i c > ch (ch value + int(power(2, 1)) cout < Decimal value is"<<value<endl double power (double x, int n double val=1.0 运行结果: while (n-val*=x Enter an 8 bit binary number 01101001 return(val) Decimal value is 105#include <iostream> using namespace std; double power (double x, int n); int main() { int i; int value = 0; char ch; cout << "Enter an 8 bit binary number "; for (i = 7; i >= 0; i--) { cin >> ch; if (ch == '1') value += int(power(2,i)); } cout <<"Decimal value is "<<value<<endl; } double power (double x, int n) { double val = 1.0; while (n--) val *= x; return(val); } 运行结果： Enter an 8 bit binary number 01101001 Decimal value is 105 9