---------------------------------
Enter any 5 numbers: 0 1 3 2 11
0 is not even number.
total exists even = 1
total exist odd = 3
--------------------------------
这就是我所做的：
#include<iostream>
using namespace std;
int main()
{
int i,j=0,c=0;
for(i=0;i<5;i++)
{
cout<<"enter 5 numbers "<<i ;
cin>>i;
}
if(i==0)
{
cout<< "0 is not even number"<<endl;
}
else if(i%2==0)
{j++;}
else if(i%2 !=0)
{c++;}
cout<<"total exists even : "<<j<<endl;
cout<<"total exists ODD : "<<c<<endl;
return 0;
}
答案 0 :(得分：1)
逐步检查代码（请注意格式更改！）
#include<iostream>
using namespace std; // usually considered bad practice
int main()
{
int i, j=0, c=0;
for(i = 0; i < 5; i++)
{
cout << "enter 5 numbers " << i;
cin >> i; // you are overwriting your loop variable!!!
// how do you think your program will go on if you enter
// e. g. 7 right in the first loop run?
// additionally, you did not check the stream state afterwards
// if user entered something invalid (e. g. S), cin sets the
// fail flag and stops further reading - attemps doing so yield
// 0 (since C++11) or don't modify the variable (before C++11)
}
// this section is outside the loop already!
// so you are only checking the number you read in your loop in the very last run
if(i == 0)
{
cout << "0 is not even number" << endl;
}
else if(i % 2 == 0)
{
j++;
}
// this check is redundant: it is the complement to your previous
// check, so if the first went wrong, the second cannot be false any more
// (compare: you did not check for i != 0 either before doing the modulo check)
else /* if(i % 2 != 0) */
{
c++;
}
cout << "total exists even: " << j << endl;
cout << "total exists odd: " << c << endl;
return 0;
}
更改的代码：
#include<iostream>
int main()
{
// several serious coding guide lines mandate: only one variable per line:
unsigned int odd = 0;
unsigned int even = 0;
// I used unsigned int here, negative counts are just meaningless...
// I'm consequent in these matters, but range of (signed) int suffices anyway,
// so you can use either one...
// C++ is not C (prior to C99) - keep scope of variables as local as possible
// (loop counter declared within for header, local variable within body)
for(unsigned int i = 0; i < 5u; i++) // (unsigned? see above)
{
std::cout << "enter 5 numbers (" << i << "): ";
int n; // separate variable!
if(!(std::cin >> n))
{
// some appropriate error handling!!! e. g.:
std::cout << "invalid value entered";
return -1;
}
// this now resides INSIDE the for loop
if(n == 0)
{
cout << "0 is not even number" << endl;
}
else
{
// this is an ALTERNATIVE calculation
n %= 2; // gets either 0 or 1...
odd += n;
even += 1 - n;
// (I personally prefer avoiding conditional branches but you *can*,
// of course, stay with the if/else you had before, too...
// - just don't check the complement as shown above)
}
}
cout << "total exists even: " << even << endl;
cout << "total exists odd: " << odd << endl;
return 0;
}
关于未签名的：有时这些是有好处的：
void f(int n) { /* need to check for both 0 <= n && n <= max! */ }
void f(unsigned int n) { /* n <= max suffices */ }
但有时必须谨慎处理：
for(unsigned int n = 7; n >= 0; --n) { /* ... */ } // endless loop!!!
for(unsigned int n = 7; n-- >= 0;) { /* ... */ } // correct variant
（第一个会使用 signed int，但不是unsigned type 的错，而是程序员没有选择正确类型的错为他或她的意图...）。
仅出于完整性考虑：假设我们可以删除数学上不正确的陈述，即零甚至不是零，那么我们可以更简单地做到这一点：
unsigned int constexpr LoopRuns = 5u;
int main()
{
unsigned int odd = 0; // just one single variable...
for(unsigned int i = 0; i < LoopRuns; i++)
{
std::cout << "enter 5 numbers (" << i << "): ";
int n;
if(!(std::cin >> n))
{ /* ... */ }
odd += n %= 2;
}
// one single difference instead of five additions...
cout << "total exists even: " << LoopRuns - odd << endl;
cout << "total exists odd: " << odd << endl;
return 0;
}
答案 1 :(得分：0)
该程序将为您提供帮助。
#include <iostream>
int main () {
int num[5], even = 0, odd = 0;
bool hasZero = false;
std::cout << "Enter 5 numbers:"
for (int i = 0; i < 5; i++) {
std::cin >> num[i];
}
for (int i = 0; i < 5; i++) {
if (num[i] == 0) { // Checking if the current number is zero
hasZero = true;
} else if (num[i] % 2 == 0 ) { // Checking if the current number is even
++even;
} else { // If the number is not even, then it must be odd
++odd;
}
}
if (hasZero) { // If the input has zero then print following statement
std::cout << "0 is not an even number" << std::endl;
}
std::cout << "Total even count: " << even << std::endl;
std::cout << "Total odd count: " << odd << std::endl;
return 0;
}
如果您听不懂任何内容，那么下面的评论部分将非常欢迎您！）
您的代码有问题：
在for语句中，counter和input使用相同的变量，即i。这样既不会正确执行for循环，也不会正确捕获输入。
每次输入任何内容都会覆盖i变量，那么只有最后一个输入（5个输入中的 ）将存储在内存中。
您正在使用if statement检查最后一个输入，因为循环之前已经结束。
如果您希望代码正常运行，则可以进行以下修改：
#include<iostream>
using namespace std;
int main()
{
int num,j=0,c=0; // Change the name to num here, because i will be used later as a counter variable.
for(int i=0;i<5;i++)
{
cout<<"enter 5 numbers "<<i ;
cin>>num;
// Don't end for loop here, this will not allow every input to be checked.
if(num==0)
{
cout<< "0 is not even number"<<endl;
}
else if(num%2==0)
{
j++;
}
else if(num%2 !=0) // Or just add a *else* here instead of *else if*, they will work exactly the same here.
{
c++;
}
} // End of for loop
cout<<"total exists even : "<<j<<endl;
cout<<"total exists ODD : "<<c<<endl;
return 0;
}
答案 2 :(得分：0)
首先，0 是一个偶数，并且代码需要适当缩进，这样您就可以看到您确实将输入读入一个整数，该整数也可以控制循环，并且您的if语句位于for循环之外（尽管缩进具有误导性。这是一个简单的示例实现，但是您可以（并且应该）修复我在自己的代码中指出的错误：
#include <iostream>
int main() {
std::cout << "Enter 5 numbers\n";
int cnt(5);
int n, odd(0), even(0);
while(cnt-- && (std::cin >> n))
n % 2 ? ++odd : ++even;
std::cout << odd << " odd, "
<< even << " even numbers" << std::endl;
return 0;
}
请注意递减和&& short-circuits的事实。
答案 3 :(得分：0)
这应该是您的代码： 您采用一个整数数组来存储输入值。前往https://www.tutorialspoint.com/cprogramming/c_arrays.htm以了解更多的abour数组。
#include<iostream>
using namespace std;
int main(){
int i,j=0,c=0;
int numbers[5];
for(i=0;i<5;i++){
cout<<"enter 5 numbers "<<i ;
cin>>numbers[i];
}
for(i=0;i<5;++i){
if(numbers[i]==0)
{
cout<< "0 is not even number"<<endl;
}
else if(numbers[i]%2==0)
{j++;}
else if(numbers[i]%2 !=0)
{c++;}
}
cout<<"total exists even : "<<j<<endl;
cout<<"total exists ODD : "<<c<<endl;
return 0;
}
答案 4 :(得分：-1)
using namespace std;
int main()
{
int * Array = new int[5];
int even(0), odd(0);
for(int i = 0; i < 5; i++)
{
cout<<"enter "<< i+1 << "-th number: " << flush;
cin>>Array[i];
if(!Array[i])
{
cout<< "0 is not even number... input again"<<endl;
i = i-1;
}
else
{
if(Array[i]&1) odd++;
else even++;
}
}
cout<<"total exists even : "<<even<<endl;
cout<<"total exists ODD : "<<odd<<endl;
cin.get(); cin.get();
delete[] Array;
return 0;
}