Absolute C++ Chapter 3 Self-Test Exercise(2)

7.Wow

8. 

int sum(int firstNum,int secNum,int thirdNum);
int sum(int firstNum,int secNum,int thirdNum)
{　
　　sumall=firstNum+secNum+thirdNum;
　　return sumall
}

9.

char determine(double parameter);
char determine(double parameter)
{
　　if(parameter>0)
　　　　return 'P';
　　else
　　　　return 'N';
}

10.No

11.You got to include the library when using the predefine the function.

You have to declare before you use the function

12.

bool inOrder（int first,int second, int third)
{
　　if((first<=second)&&(second<=third))
　　　　return true；
　　else
　　　　return false;
}

13

bool even(int number)
{
　　if(number%2==0)
　　　　return true;
　　else
　　　　return false;
}
　　

14.

bool isDigit(char Letter)
{
　　if((Letter>='0')&&(Letter<='9'))
　　　　return true;
　　else
　　　　return false;
}