73842

Run ID	作者	问题	语言	测评结果	Time	Memory	代码长度	提交时间
73842	何嘉乐	二进制小数转十进制	C++	Compile Error	0 MS	0 KB	800	2024-05-19 18:01:16

Tests(0/0):

Code:

int main() { string s; cin>>s; //查号是否有小数点 int len=s.size();//计算字符串的整体长度 int dian=-1; for(int i=0; i<len; i++) { if(s[i]==',') { dian=i; break; } } double sum=0; if(dian==-1) { //没有小数部分 //处理整数部分 int a[len]; int j=0; for(int i=len-1; i>=0; i--) { a[j]=s[i]-'0'; j++; } for(int i=0; i<len; i++) { sum+=pow(2,i)*a[i]; } cout<<sum; return 0; } else { //处理整数部分 int a[dian]; int j=0; for(int i=dian; i>=0; i--) { a[j]=s[i]-'0'; j++; } for(int i=0;i<dian;i++){ sum+=pow(2,i*a[i]); } //处理小数部分 int k=1; for(int i=dian+1; i<len; i++) { sum+=pow(2,-k)*(s[i]-'0'); k++; } } cout<<sum; }

Run Info:

Main.cc: In function 'int main()':
Main.cc:2:2: error: 'string' was not declared in this scope
  string s;
  ^
Main.cc:3:2: error: 'cin' was not declared in this scope
  cin>>s;
  ^
Main.cc:3:7: error: 's' was not declared in this scope
  cin>>s;
       ^
Main.cc:25:16: error: 'pow' was not declared in this scope
    sum+=pow(2,i)*a[i];
                ^
Main.cc:28:3: error: 'cout' was not declared in this scope
   cout<