[英]Biginteger Addition in C++
I am trying to add two big integers. 我正在尝试添加两个大整数。 Here is a function I have made. 这是我做的功能。 s1
is the larger string in it. s1
是其中的较大字符串。 During passing the function parameter I will account for the string length. 在传递函数参数期间,我将考虑字符串长度。 The code works fine for all values except those having 10^(n). 该代码适用于除具有10 ^(n)的所有值之外的所有值。 As such it shows o/p as 2 for 100 + 2. Similarly for other power of 10 cases. 因此,对于100 + 2,它的o / p显示为2。对于其他10次幂的情况,也是如此。 When I did some digging I noticed that the for loop runs just once for these cases. 当我进行一些挖掘时,我注意到对于这些情况,for循环仅运行一次。 As such s1.length()
reports length as 1. How can I fix it ? 这样s1.length()
报告的长度为1。如何解决?
void addBigInteger (string s1,string s2) {
string str3;
reverse(s1.begin(),s1.end());
reverse(s2.begin(),s2.end());
int temp = 0,carry=0,i;
for (i=0;i<s1.length();i++) {
if ((i+1) > s2.length())
s2[i] = '0';
temp = s1[i]-'0'+s2[i]-'0'+carry;
str3[i] = temp%10 + '0';
carry = temp/10;
}
while (carry!=0) {
str3[i++] = carry%10 + '0';
carry = carry/10;
}
for (i;i>=0;i--) {
cout << str3[i];
}
cout << endl;
}
You need to use str2.push_back('0')
to append characters instead of assigning str2[i]
with out-of-bound i
. 您需要使用str2.push_back('0')
附加字符,而不是为str2[i]
分配超出范围的i
。 std::string::operator[]
does not "grow" the internal storage in the string. std::string::operator[]
不会“增长”字符串中的内部存储。
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