C++ 加减乘除计算器

#include using namespace std;int getDigits(int n){if (n == 0){return 1;}int digits = 0;while (n){digits++;n /= 10;}return digits;}int getFirst(int n,int i){if (n == 0){return 0;}while (i--){n /= 10;}return n % 10;}int main(){int op1,op2,ans,digits;char oper;cin >> op1 >> oper >> op2;if (oper == '+'){ans = op1 + op2;digits = getDigits(ans);for (int i = 0; i < digits - getDigits(op1); i++){cout