# Solved: fahrenheit to celsius formula

The task of conversion between Fahrenheit and Celsius temperatures is a common problem that programmers might encounter, especially when working on scientific calculations or weather applications. The formulas for these conversions have been known for centuries, yet implementing them in a programming language like C presents its own set of challenges and rewards. C is a general-purpose programming language that is extremely popular for a wide variety of programming tasks due to its flexibility, efficiency, and control.

The formulas for converting Fahrenheit to Celsius and vice-versa are as follows:

– To convert from Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature, then multiply the result by 5/9.

– To convert from Celsius to Fahrenheit, multiply the Celsius temperature by 9/5, then add 32 to the result.

Let’s delve into the details of how we can implement a program to perform these conversions in C.

```#include <stdio.h>

int main(){
float fahr, celsius;

printf("Enter the temperature in Fahrenheit: ");
scanf("%f", &fahr);

celsius = (fahr - 32) * 5/9;
printf("Temperature in Celsius: %.2f", celsius);

return 0;
}
```

## Understanding the Fahrenheit to Celsius conversion code

In the aforementioned C program, firstly, two floating-point variables, `fahr` and `celsius`, are declared. The `fahr` variable will hold the temperature in Fahrenheit entered by the user, and the `celsius` variable will hold the converted temperature in Celsius.

Following that, the `scanf` function is used to get the input from the user. This standard library function reads the input from the standard input (usually the keyboard). The `&fahr` argument is used to determine where to store the input value.

## Library functions and their use in the program

We then apply the formula to convert Fahrenheit to Celsius and store the result in the `celsius` variable. Finally, the `printf` function, another standard library function, is used to print the converted temperature to the standard output (usually the screen). The `%.2f` inside the `printf` statement is used to print the floating point number with a precision of two decimal places.

It’s also important to note the use of `#include ` at the start of the code. This is a preprocessor command that includes the contents of stdio.h (Standard Input/Output header file) in our program. The `printf` and `scanf` functions are declared in this header file, and including it in the program enables us to use these functions.

Overall, this code is a concise and efficient solution to the problem of converting Fahrenheit to Celsius. By using the standard library functions provided by C and implementing the well-known mathematical formula, we can quickly and accurately perform the conversion.

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