Question

Write C++ Code in single source file (.cpp file) containing following user defined functions:

1. IsEven- takes an integer input (one argument of type int) and return true or false.

2. IsPositive- takes a float input (one argument of type double) and return a Boolean value. The function returns the true if its argument is positive and false if its argument is zero or negative.

3. IsPrime- takes an integer input and return true or false.

4. NumOfDigits- takes an integer input and return number of digits in that integer.

Instructions: After writing these functions, show usage of these functions in main () function by calling these functions and showing their output.

Answer 1

#include<iostream>
#include<iomanip>

using namespace std;

bool isEven(int num){
if(num%2 == 0){ //if even, return true
return true;
}
return false; //else return false
}

bool isPositive(double num) {
if(num>0){ //if positive number, return true
return true;
}
return false; //else return false
}

bool isPrime(int num){
for(int i=2;i<=num/2;i++){
if(num%i == 0){
return false; //not prime no
}
}
return true; //return true, prime
}

int NumOfDigits(int num){
int n = 0;
while(num!=0){
n++;//count digit
num = num/10;
}
return n;
}

int main() //main function
{
cout<<"isEven(4): "<<std::boolalpha <<isEven(4)<<endl;
cout<<"isEven(3): "<<isEven(3)<<endl;
cout<<"isPositive(4.0): "<<isPositive(4.0)<<endl;
cout<<"isPositive(-4.0): "<<isPositive(-4.0)<<endl;
cout<<"isPrime(4): "<<isPrime(4)<<endl;
cout<<"isPrime(3): "<<isPrime(3)<<endl;
cout<<"NumOfDigits(434): "<<NumOfDigits(434)<<endl;
return 0;

}