C program to display the float number on the defined decimal places.

#include <stdio.h>
int main() {
float number;
int decimalPlaces;

// Get the float input from the user.
printf("Enter a floating-point number: ");
scanf("%f", &number);

// Get the desired number of decimal places from the user.
printf("Enter the number of decimal places to display: ");
scanf("%d", &decimalPlaces);

// Input validation: Check if the number of decimal places is valid. if (decimalPlaces < 0) {
printf("Number of decimal places must be non-negative.\n");
return 1; // Return an error code
}
// Print the float with the specified precision.
// Use the format specifier "%.*f" to dynamically set the precision.
printf("Formatted number: %.*f\n", decimalPlaces, number);
return 0; // Return success code.
}

Program Description:
Include Header: The line #include <stdio.h> includes the standard input/output library, which provides functions like printf for printing to the console and scanf for reading input from the user.

Declare Variables:
float number: This variable will hold the floating-point number entered by the user.
int decimalPlaces: This variable will be used to store the decimal places that the user wishes to display.

Take Input:
The program asks the user to enter a floating-point number by using printf("Enter a floating-point number: ").
The scanf("%f", &number); function takes input in the form of a floating point number and saves it on the number variable. The %f is to get a float, while the & is the address of operator which gives memory location for variable number so scanf can store the input there.
It then asks the user to enter the desired number of decimal places using printf("Enter the number of decimal places to display: ");.
The scanf("%d", &decimalPlaces); function reads the integer entered by the user and stores it in the decimalPlaces variable. The %d format specifier is used to read an integer.

Validate Input:
The program checks if the entered decimalPlaces is negative by if(decimalPlaces < 0).
If decimalPlaces is negative, this program prints an error message using printf("Number of decimal places must be non-negative.\n"); and returns 1 for an error condition.

Print Output:
The program prints out the formatted floating-point number using printf("Formatted number: %.*f\n", decimalPlaces, number).
%.*f is a format specifier; at runtime, the * is replaced by the value of decimalPlaces, allowing precision to be specified dynamically. If, for example, decimalPlaces equals 2 and number equals 3.14159, the output will be "Formatted number: 3.14".
\n is a newline character, moving the cursor to the next line in the console.
Return 0:
The program returns 0, thus indicating that it has executed successfully.

Practice/Assignment set 2:
1. C program to find sum of the square of all natural numbers from 1 to N.
Series: 1^2+2^2+3^2+4^2+..N^2
2. C program to find sum of the all natural numbers from 1 to N.
Series: 1+2+3+4+..N
3.C program to find the sum of Natural Number/Factorial of Number of all natural numbers from 1 to N.
Series: 1/1! + 2/2! + 3/3! + 4/4! + ... N/N!
4) C program to find sum of following series:
1+ 1/2 + 1/3 + 1/4 + 1/5 + .. 1/N
5) C program to find sum of following series:
1 + 3^2/3^3 + 5^2/5^3 + 7^2/7^3 + ... till N terms

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