[英]Why isn't my “else if” statement working?
由於某種原因,我的else if
語句不起作用。 當我用輸入“ 20”運行代碼時,我的else if
語句應該對此進行校正時,我得到了階乘的表達式然后是“ 20”。
#include <iostream>
unsigned int factorial(unsigned int number);
int main()
{
unsigned int number;
std::cout << "Please enter a positive interger. ";
std::cin >> number;
std::cout << "facorial of " << number << " = " << factorial(number);
return 0;
}
unsigned int factorial(unsigned int number)
{
if (number > 1 && number < 20) {
return number * factorial(number - 1);
}
else if (number >= 20) {
std::cout << "error" << std::endl;
}
else
return 1;
}
如果您沒有從其他項目中返回,那么會導致階乘函數產生未定義的返回: 如果我不將返回值放入其原型返回值的函數中,該怎么辦
您得到的數字不是函數的結果,而是一個未定義的值。
#include <iostream>
unsigned int factorial(unsigned int number);
int main()
{
unsigned int number;
std::cout<< "Please enter a positive interger. ";
std::cin >> number;
std::cout << "facorial of " << number << " = " << factorial(number);
return 0;
}
unsigned int factorial(unsigned int number)
{
if (number > 1 && number < 20){
return number * factorial(number - 1);
}
else if (number >= 20){
std::cout << "error" << std::endl;
return 0;
}
else
return 1;
}
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