C++ Program to Count Positive, Zero and Negative Numbers

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In this article, you will learn and get code on counting of positive, zero, and negative numbers in C++. The program is created in following ways:

Count Positive, Zero, and Negative numbers output of 10 given Numbers by User
Allow user to define the size for the Array
Count, Positive, Zero, and Negative numbers using while loop

Count Positive, Negative and Zero in C++

The program given below counts the occurrence (frequency) of positive, zero, and negative numbers from the given set of numbers entered by the user (at run-time) in C++ programming.

The question is, write a program in C++ that count and prints frequency of positive, zero, and negative numbers. The answer to this question is given below:

#include<iostream>
using namespace std;
int main()
{
    intpos=0, neg=0, zer=0, i, arr[10];
    cout<<"Enter 10 Numbers: ";
    for(i=0; i<10; i++)
        cin>>arr[i];
    for(i=0; i<10; i++)
    {
        if(arr[i]>0)
            pos++;
        else if(arr[i]==0)
            zer++;
        else
            neg++;
    }
    cout<<"\nFrequency of Positive Numbers: "<<pos;
    cout<<"\nFrequency of Zero: "<<zer;
    cout<<"\nFrequency of Negative Numbers: "<<neg;
    cout<<endl;
    return 0;
}

This program was build and run under Code::Blocks. Here is its sample run:

C++ program count positive negative zero

Now supply any 10 numbers say 1, 0, -3, 4, 5, 0, -8, 9, 6, 0 and press ENTER key to see the occurrence or frequency of positive, zero, and negative numbers as shown in the output given below:

In above program, when user enters 10 numbers (for example: 1, 0, -3, 4, 5, 0, -8, 9, 6, 0), then all the 10 numbers gets initialized to arr[] in following way:

arr[0]=1
arr[1]=0
arr[2]=-3
arr[3]=4
and so on, upto
arr[9]=0

Now the dry run of above program with these 10 values goes like:

Initial values, pos=0, neg=0, zer=0
Because the first for loop gets executed and 10 numbers gets received by user
So its time to execute the second for loop
Its initialization part execute at first and only at once. So i=0
Now the condition, i<10 or 0<10 evaluates to be true, therefore program flow goes inside the loop
The condition of if, that is, arr[i]>0 or arr[0]>0 or 1>0 evaluates to be true, therefore program flow goes inside if's body and the value of pos gets incremented. Becuase pos's previous value is 0, so now pos=1
Because the condition of if evaluates to be true, therefore else if and else block will not gets executed
So program flow goes back, increments the value of i (now i=1) and evaluates the condition of for loop again
That is, the condition i<10 or 1<10 again evaluates to be true, therefore program flow again goes inside the loop
And evaluates the condition of if, that is, the condition, arr[i]>0 or arr[1]>0 or 0>0 evaluates to be false, therefore program flow evaluates the condition of else if, that is the condition arr[i]==0 or arr[1]==0 or 0==0 evaluates to be true, therefore program flow goes to else if's body and the value of zer gets incremented. Because zer's previous value is 0, so now zer=1
Now again program flow goes back, increments the value of i (now i=2) and evaluates the condition of for loop again.
This process continues until the condition of for loop evaluates to be false
On continuing the dry run of this for loop, here are the values (we'll get) after each evaluation:
- pos=1
- zer=1
- neg=1
- pos=2
- pos=3
- zer=2
- neg=2
- pos=4
- pos=5
- zer=3
After exiting from the loop, print the value of each variable corresponding to positive, zero and negative numbers
That is, the variable, pos (corresponds to positive number's occurrence) holds its value as 5. So there are total of 5 positive numbers available in the list
Similarly, therefore total of 3 zeros and 2 negative numbers in the list

Allow User to Define the Size for Array

This program allows user to define the size for the array. That is, how many number, he/she wants to enter, and then find and print the occurrence of positive, zero, and negative numbers.

#include<iostream>
using namespace std;
int main()
{
    intpos=0, neg=0, zer=0, i, arr[100], tot;
    cout<<"Enter the Size (max. 100): ";
    cin>>tot;
    cout<<"Enter "<<tot<<" Numbers: ";
    for(i=0; i<tot; i++)
    {
        cin>>arr[i];
        if(arr[i]>0)
            pos++;
        else if(arr[i]==0)
            zer++;
        else
            neg++;
    }
    cout<<"\nFrequency of Positive Numbers: "<<pos;
    cout<<"\nFrequency of Zero: "<<zer;
    cout<<"\nFrequency of Negative Numbers: "<<neg;
    cout<<endl;
    return 0;
}

Below is its sample run with user input, 5 as size, and 1, -2, 3, 0, 4 as 5 numbers:

count positive and negative numbers in array c++

Note - At the time of receiving numbers, the above program counts positive, zero, and negative numbers. That is, above program does both the job of receiving and counting with only one for loop

Using while Loop

This program uses while loop to receive the input (list of numbers) and counts the occurrence of positive, zero, and negative numbers.

#include<iostream>
using namespace std;
int main()
{
    intpos=0, neg=0, zer=0, i=0, arr[100], tot;
    cout<<"Enter the Size (max. 100): ";
    cin>>tot;
    cout<<"Enter "<<tot<<" Numbers: ";
    while(i<tot)
    {
        cin>>arr[i];
        if(arr[i]>0)
            pos++;
        else if(arr[i]==0)
            zer++;
        else
            neg++;
        i++;
    }
    cout<<"\nFrequency of Positive Numbers: "<<pos;
    cout<<"\nFrequency of Zero: "<<zer;
    cout<<"\nFrequency of Negative Numbers: "<<neg;
    cout<<endl;
    return 0;
}

This program produces the same output as of previous program.

Same Program in Other Languages

C++ Online Test

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