想写一个高精度加法程序,先写了一个get函数,程序如下:
#include<iostream>
using namespace std;
int get(int a[]) {
string input;
cin >> input;
int lengthInput = input.length();
for (int i = 1; i <= lengthInput; i++) {
a[i] = input[lengthInput - i];
}
return lengthInput;
}
void add(int a[], int b[], int c[]) {
int jinWei = 0, i = 0;
while (i <= sizeof(a) || i <= sizeof(b)) {
c[i] = a[i] + b[i] + jinWei;
jinWei = (c[i] - (c[i] % 10)) / 10;
c[i] %= 10;
i++;
}
}
int main() {
extern int a[];
int lengthA = get(a);
for (int i = 1; i <= lengthA; i++) {
cout << a[lengthA - i];
}
system("pause");
return 0;
}
结果运行后报错:
error LNK2001: 无法解析的外部符号 "int * a" (?a@@3PAHA)
fatal error LNK1120: 1 个无法解析的外部命令
急!