# Exercise 1.3 - Temperature Convertor¶

## Question¶

Modify the temperature conversion program to print a heading above the table.

## Solution¶

```/***
*
* Exercise 1-3. Modify the temperature conversion program,
* Fahrenheit to Celsius, to print a heading above the table.
*
* print Fahrenheit-Celsius table for fahr = 0, 20, ..., 300;
* floating-point version.
*
***/

#include <stdio.h>

int main(void) {
printf("A program print Fahrenheit-Celsius\n");

float fahr, celsius;
int lower, upper, step;

lower = 0;
upper = 300;
step = 20;

fahr = lower;

printf("Fahr\tCelsius\t \n");

while (fahr <= upper) {
celsius = (5.0 / 9.0) * (fahr - 32.0);
printf("%4.0f %10.1f\n", fahr, celsius);
fahr = fahr + step;
}

return 0;
}
```

### Explanation¶

In this program we are going to convert a given Fahrenheit temperature to Celsius temperature using the formula C=(5/9)(F-32) To do this we declare some variables in the beginning of the program so that they can be used in the later stages of the program. The variables in this program are: lower,upper,step, celsius,fahr. The variable lower is assigned the value 0 similarly upper to 300, step to 20, and fahr to lower. So when the program enters the while loop it checks whether fahr <= upper is true, if it is true then it assigns the variable celsius 5 * (fahr - 32) / 9 and then it prints output.