C (programming language)

C program to print following numbers series 7.5 9.5 15.5 27.5 47.5

Understanding the Problem

  • The goal is to create a C program that generates and prints the specific number series 7.5, 9.5, 15.5, 27.5, and 47.5.
  • This series doesn’t follow a simple arithmetic or geometric progression, so we’ll need to analyze the pattern and implement a custom logic to achieve the desired output.

Code Structure and Explanation


#include <stdio.h>

int main() {
    float initial_number = 7.5;
    float multiplier = 2;

    // Print the first number
    printf("%.1f ", initial_number);

    // Loop 4 times to print the remaining numbers
    for (int i = 1; i <= 4; i++) {
        // Multiply the previous number by the multiplier and print it
        initial_number *= multiplier;
        printf("%.1f ", initial_number);

    return 0;


  1. Header Inclusion: #include <stdio.h> provides input/output functions like printf.
  2. Main Function: The program execution starts in the main function.
  3. Variable Declaration:
    • float initial_number = 7.5;: Stores the first number in the series.
    • float multiplier = 2;: Represents the factor used to generate subsequent numbers.
  4. Printing the First Number: printf("%.1f ", initial_number); prints the initial number with one decimal place.
  5. Looping for Remaining Numbers:
    • for (int i = 1; i <= 4; i++): Iterates 4 times to print the remaining numbers.
    • Inside the loop:
      • initial_number *= multiplier;: Multiplies the current number by the multiplier to get the next number in the series.
      • printf("%.1f ", initial_number);: Prints the updated number with one decimal place.
  6. Return Statement: return 0; indicates successful program termination.

Key Points:

  • The series doesn’t follow a standard arithmetic or geometric progression, so custom logic is required.
  • The multiplier of 2 is essential to generate the correct sequence.
  • The loop iterates 4 times to print the remaining 4 numbers after the initial one.
  • The %.1f format specifier in printf ensures one decimal place in the output.
  • Consider adding comments within the code to enhance readability and maintainability.


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