这个程序麻烦实现A+B，请大神指点
#include<iostream>
#include<string>
using namespace std;
int num;
void main()
{
cin>>num;
string * A=new string[num],* B=new string[num];
string * pri=new string[num];
for(int i=0;i<num;i++)
{
cin>>A[i]>>B[i];
char C;
int f=0;
for(int k=A[i].length()>B[i].length()?A[i].length()-1:B[i].length()-1;k>-1;k--)
{
C=A[i][k]+B[i][k]-48+f;
f=0;
if(C>57)
{C=C-10;f=1;}
pri[i]+=C;
}
pri[i]+=char(48+f);
}
for(int j=0;j<num;j++)
{
cout<<"Case "<<j+1<<":\n";
cout<<A[j]<<" + "<<B[j]<<" = ";
if(pri[j][(int)pri[j].length()-1]=='1')
{
cout<<'1';
}
for(int m=(int)pri[j].length()-2;m>-1;m--)
{cout<<pri[j][m];}
cout<<"\n\n";
}
}
[解决办法]
问题的解决从格式化代码开始：
# include <iostream>
# include <string>
using namespace std;
int num;
void main()
{
cin >> num;
string * A = new string[num], * B = new string[num];
string * pri = new string[num];
for (int i = 0; i < num; i++)
{
cin >> A[i] >> B[i];
char C;
int f = 0;
for (int k = A[i].length() > B[i].length() ? A[i].length() - 1 : B[i].length() - 1; k > -1; k--)
{
C = A[i][k] + B[i][k] - 48 + f;
f=0;
if (C > 57)
{
C = C - 10;
f = 1;
}
pri[i] += C;
}
pri[i] += char(48 + f);
}
for (int j = 0; j < num; j++)
{
cout << "Case " << j + 1 << ":\n";
cout << A[j] << " + " << B[j] << " = ";
if (pri[j][(int)pri[j].length() - 1] == '1')
{
cout << '1';
}
for (int m = (int)pri[j].length() - 2; m > -1; m--)
{
cout << pri[j][m];
}
cout << "\n\n";
}
}
# include <iostream>
# include <string>
# include <vector>
using namespace std;
string add(string & aa, string & bb)
{
string a(aa.rbegin(), aa.rend());
string b(bb.rbegin(), bb.rend());
vector<char> r;
size_t i = 0;
int carry = 0;
int tmp;
while (i < a.length() && i < b.length())
{
tmp = (a[i] - '0') + (b[i] - '0') + carry;
r.push_back(tmp % 10 + '0');
if (tmp >= 10)
carry = 1;
i++;
}
while (i < a.length())
{
tmp = (a[i] - '0') + carry;
r.push_back(tmp % 10 + '0');
if (tmp >= 10)
carry = 1;
i++;
}
while (i < b.length())
{
tmp = (b[i] - '0') + carry;
r.push_back(tmp % 10 + '0');
if (tmp >= 10)
carry = 1;
i++;
}
if (carry > 0)
r.push_back(carry + '0');
string rr(r.rbegin(), r.rend());
return rr;
}
int main()
{
int n;
cin >> n;
for (int i = 0; i < n; i++)
{
string a, b, r;
cin >> a >> b;
r = add(a, b);
cout << "Case " << i + 1 << ":\n";
cout << a << " + " << b << " = " << r << "\n\n";
}
return 0;
}
4
1 2
112233445566778899 998877665544332211
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 1
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
Case 1:
1 + 2 = 3
Case 2:
112233445566778899 + 998877665544332211 = 1111111111111111110
Case 3:
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 + 1 = 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
Case 4:
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 + 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 = 1999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999998
