Exercise 1.3 - Temperature Convertor

Question

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

Solution

/* Temperature Conversion Program, Fahrenheit to Celsius */

#include<stdio.h>

/* print Fahrenheit-Celsius table for fahr = 0,20 ... 300 */

int main()
{
    printf("A program print Fahrenheit-Celsius\n");
    int lower,upper,step;
    int celsius,fahr;

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

    fahr = lower;

    while( fahr <= upper)
    {
        celsius =  5 * (fahr - 32) / 9;
        printf("%d\t%d\n",fahr,celsius);
        fahr = fahr + step;
    }

    return 0;
}
Run this

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.

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