Re: [問題] 還有一問 結果又不如預期了
※ 引述《NOtWorThy》之銘言:
如下
#include <iostream>
#define max 45
using namespace std;
int add(int *a, int *b, int *c, int n){
int i, carry = 0;
for(i = n - 1; i >= 0; i--){
c[i] = (int)a[i] + (int)b[i] + carry;
if(c[i] < 10) carry = 0;
else { c[i] = c[i]%10; carry = 1; }
}
return carry;
}
void sub(int *a, int *b, int *c, int n){
int i, borrow = 0;
for(i = n - 1; i >= 0; i--){
c[i] = a[i] - b[i] - borrow;
if(c[i] >= 0) borrow = 0;
else { c[i] = (c[i]+10); borrow = 1; }
}
}
void print_add(int *a, int c){
cout << "add operation:";
!c ? cout << "" : cout << c;
for(int i = 0; a[i]!=-1; i++ ) { cout << a[i]; }
cout << endl;
}
void print_sub(int *a, bool large){
cout << "sub operation:";
large ? cout << "" : cout << '-';
for(int i = 0; a[i]!=-1; i++ ) { cout << a[i]; }
cout << endl;
}
int main(){
int N = 0; /* 用來計運算元的位數 */
int M = 0;
char array_a[max]; int temp_a[max];
char array_b[max]; int temp_b[max];
int array_c[max];
for(int i = 0; i < max; i++) {
temp_a[i] = -1;
temp_b[i] = -1;
array_c[i] = -1;
}
char read;
cout << "請輸入兩整數:" ;
cin >> array_a; for(;array_a[N]!='\0';N++) {}
cin >> array_b; for(;array_b[M]!='\0';M++) {}
/* cout << "N = " << N << " M = " << M << endl; */
v下面當 M or N > max 就炸了
cout << "number_1:";
for(int i = 0; i < N; i++) {
cout << (int)array_a[i] - '0';
^沒有檢查輸入的正確性
若假設是正確的,cout << array_a[i];,豈不是更好?
而既然如此,cout << array_a;,就好囉~無需這個 for-loop
temp_a[i] = (int)array_a[i] - '0';
^那麼將此行放到前一個 for-loop 就可以節省執行時間,豈不更完美?
}
cout << endl;
^那就併成 cout << array_a << endl;
cout << "number_2:" ;
for(int i = 0; i < M; i++) {
cout << (int)array_b[i] - '0';
temp_b[i] = (int)array_b[i] - '0';
}
cout << endl;
^同上述
//////////////////////////////////////////////////////////////////////////////
bool large;
int *tt_large, *tt_small;
int c = 0, delta = 0, j, K;
j = (N == M) ? 0 : N;
while(j < N && temp_a[j] == temp_b[j]) {
j++;
}
if(N > M || (N == M && temp_a[j] > temp_b[j]) {
tt_large = temp_a;
tt_small = temp_b;
delta = N - M;
large = true;
K = N;
} else if(N < M || (N == M && temp_a[j] > temp_b[j]) {
tt_large = temp_b;
tt_small = temp_a;
delta = M - N;
large = false;
K = M;
}
if(delta != 0) {
for(j = K-1 ; j >= 0 ; j--) {
if(j >= delta)
tt_small[j] = tt_small[j-delta];
else
tt_small[j] = 0;
}
}
c = add(tt_large, tt_small, array_c, K);
print_add(array_c, c);
sub(tt_large, tt_small, array_c, K);
print_sub(array_c, large);
//////////////////////////////////////////////////////////////////////////////
int c = 0, delta = 0;
if(N > M){
delta = N - M; int j;
for(int j = N-1; j >= 0; j--){
if(j >= delta)
temp_b[j] = temp_b[j-delta];
else temp_b[j] = 0;
}
c = add(temp_a, temp_b, array_c, N);
print_add(array_c, c);
sub(temp_a, temp_b, array_c, N);
print_sub(array_c, true);
}
else if (M > N){
delta = M - N; int j;
for(int j = M-1; j >= 0; j--){
if(j >= delta)
temp_a[j] = temp_a[j-delta];
else temp_a[j] = 0;
}
c = add(temp_b, temp_a, array_c, M);
print_add(array_c, c);
sub(temp_b, temp_a, array_c, M);
print_sub(array_c, false);
}
else {
c = add(temp_b, temp_a, array_c, M);
print_add(array_c, c);
(temp_a[0] > temp_b[0]) ?
sub(temp_a, temp_b, array_c, N) : sub(temp_b, temp_a, array_c, N);
(temp_a[0] > temp_b[0]) ?
print_sub(array_c, true) : print_sub(array_c, false);
^ temp_a[0] == temp_[b] && temp_a[1] > temp_b[1] 時 ,large 為 false???
}
system("pause");
return 0;
}
執行結果目前TEST都OK 謝謝大家幫忙 再次感謝
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※ 編輯: NOtWorThy 來自: 140.113.91.18 (04/28 12:26)
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