[英]Program to print Factorial of a number in c++
Q) Write a program that defines and tests a factorial function. The factorial of a number is the product of all whole numbers from 1 to N. For example, the factorial of 5 is 1 * 2 * 3 * 4 * 5 = 120 Q) 编写一个程序,定义并测试一个阶乘 function。一个数的阶乘是从 1 到 N 的所有整数的乘积。例如,5 的阶乘为 1 * 2 * 3 * 4 * 5 = 120
Problem: I am able to print the result,but not able to print like this:问题:我能够打印结果,但不能像这样打印:
let n = 5
Output : 1 * 2 * 3 * 4 * 5 = 120;
My Code:我的代码:
# include <bits/stdc++.h>
using namespace std;
int Factorial (int N)
{
int i = 0;int fact = 1;
while (i < N && N > 0) // Time Complexity O(N)
{
fact *= ++i;
}
return fact;
}
int main()
{
int n;cin >> n;
cout << Factorial(n) << endl;
return 0;
}
I am able to print the result,but not able to print like this: let n = 5 Output: 1 * 2 * 3 * 4 * 5 = 120;
我能够打印结果,但不能像这样打印:let n = 5 Output: 1 * 2 * 3 * 4 * 5 = 120;
That's indeed what your code is doing.这确实是您的代码正在做的事情。 You only print the result.
您只打印结果。 If you want to print every integer from 1 to N before you print the result you need more cout calls or another way to manipulate the output.
如果您想在打印结果之前打印从 1 到 N 的每个 integer,则需要更多 cout 调用或其他方式来操作 output。
This should only be an idea this is far away from being a good example but it should do the job.这应该只是一个想法,这远不是一个很好的例子,但它应该可以完成工作。
int main()
{
int n;cin >> n;
std::cout << "Factorial of " << n << "!\n";
for (int i =1; i<=n; i++)
{
if(i != n)
std::cout << i << " * ";
else
std::cout << n << " = ";
}
cout << Factorial(n) << endl;
return 0;
}
Better approach using std::string and std::stringstream使用std::string和std::stringstream的更好方法
#include <string>
#include <sstream>
using namespace std;
int main()
{
int n;
cin >> n;
stringstream sStr;
sStr << "Factorial of " << n << " = ";
for (int i = 1; i <= n; i++)
{
if (i != n)
sStr << i << " * ";
else
sStr << i << " = ";
}
sStr << Factorial(n) << endl;
cout << sStr.str();
return 0;
}
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