Write a C++ program to print a number from 1 to a user entered number. Only accept numbers from 1 to 100

Question

I'm currently in a C++ class and I'm not sure what to do in this particular assignment. The book isn't very helpful and I feel like I need assistance. Here is the assignment:

Write a C++ program to print a number from 1 to a user entered number. Only accept numbers from 1 to 100; Example: Enter the number: 15 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.

At first, I thought, maybe it was a guessing game, but it asks to PRINT all the numbers from 1-100. I know I need to use a for loop. Here is what I have so far:

#include <iostream>
#include <cstdlib>
#include <ctime>
{

 int num = 15; 
for (int i = 0; i < 100; i++)

}
system ("Pause")

Answer 1

1. You probably DON'T need "cstdlib".

2. Instead, consider using "cin" and "cout":

http://www.cplusplus.com/doc/tutorial/basic_io/

int age;
cin >> age;
...
cout << "I am " << age << " years old.";

3. As far as "pause", one alternative is std::cin.ignore(); :

Is there a decent wait function in C++?

4. Of course, you also need a function main() somewhere, if you don't already have one. Your example has no function, and won't compile as-is.

Answer 2

From what I understand, you need to print numbers from the 1 to the user-inputed number (but only accept numbers from 1 to 100). Then the following should work:

// This will import the libraries we need for input and output
#include <iostream>                                                             

int main(int argc, char * argv[]) {                           

    // This will get the number from the user          
    int num;                                                                    
    std::cin >> num;                         

    // We check if it's in the right range; if so, print the numbers we want                                   
    if(0 < num && num <= 100) {                                                 
        for(int i = 1; i <= num; i++) {                                         
            std::cout << i << std::endl;                                        
        }                                                                       
    }                                                                           
    return 0;                                                                   
}