C Exercises: Count and compute positive, negative numbers and average with two digits after the decimal number

C Basic Declarations and Expressions: Exercise-105 with Solution

Count positive/negative numbers and calculate their averages

Write a C program that accepts seven floating point numbers and counts the number of positive and negative numbers. Print the average of all positive and negative values with two digits after the decimal number.

Sample Solution:

C Code:

#include <stdio.h>
int main () {

    float x, p_avg = 0, n_avg = 0, temp_p = 0, temp_n = 0;
    int i, p_ctr = 0, n_ctr = 0;

    // Prompt the user to input 7 numbers
    printf("Input 7 numbers(int/float):\n");

    // Loop through 7 times to read the numbers
    for (i = 0; i < 7; i++){

        // Read a number
        scanf("%f", &x);

        // Check if the number is positive
        if (x > 0){
            p_ctr++;  // Increment positive counter
            temp_p += x;  // Sum positive numbers
        }

        // Check if the number is negative
        if (x < 0){
            n_ctr++;  // Increment negative counter
            temp_n += x;  // Sum negative numbers
        }
    }

    // Calculate the average of positive numbers
    p_avg = temp_p/p_ctr;

    // Calculate the average of negative numbers
    n_avg = temp_n/n_ctr;

    // Check if there were positive numbers
    if (p_ctr > 0){
        printf("\n%d Number of positive numbers: ", p_ctr);
        printf("Average %.2f\n", p_avg);
    }

    // Check if there were negative numbers
    if (n_ctr > 0){
        printf("\n%d Number of negative numbers: ", n_ctr);
        printf("Average %.2f\n", n_avg);
    }
}

Sample Output:

Input 7 numbers(int/float):
25
35.75
15
-3.5
40
35
16

6 Number of positive numbers: Average 27.79

1 Number of negative numbers: Average -3.50

Flowchart:

C programming Code Editor:

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