[英]Why isn't my “else if” statement working?
由于某种原因,我的else if
语句不起作用。 当我用输入“ 20”运行代码时,我的else if
语句应该对此进行校正时,我得到了阶乘的表达式然后是“ 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;
}
如果您没有从其他项目中返回,那么会导致阶乘函数产生未定义的返回: 如果我不将返回值放入其原型返回值的函数中,该怎么办
您得到的数字不是函数的结果,而是一个未定义的值。
#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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