CASE STUDY $1$

The $\%$ Daily Value $($or $\%$DV$)$ shows how much of a nutrient is in one serving of a packaged food. The $\%$DVs are based on the values for key nutrients, which are the amounts $($in grams$)$ of nutrients recommended per day for individuals $4$ years of age and older. To calculate the $\%DV$ of a packaged food, you have to divide the nutrient amount per serving by the daily recommended value and multiply by $100.$ To know whether you are getting enough amount of a certain nutrient from a packaged food, the following level of categorization applies:

$5\%$ or less of a nutrient per serving is low

More than $5\%$ but less than $20\%$ of a nutrient per serving is moderate

$20\%$ or more of a nutrient per serving is high

Write a complete $C$ program that reads a list of data $($cereal type, carbohydrate in ounce, protein in ounce, fat in ounce$)$ from an input file. Prepare the input file as shown in Figure $1\mathrm{.}1$ with data for $10$ types of cereal. For the first four types of cereal $($Cereal A$,$ B$,$ C$,$ D$),$ use the values as shown in the figure below. Complete the file for the remaining six types of cereal with your own values.

$\backslash$table$[[$Cereal$,$A$,2\mathrm{.}64,0\mathrm{.}26,0\mathrm{.}36],[$Cereal$,$B$,0\mathrm{.}34,0\mathrm{.}53,0\mathrm{.}07],[$Cereal$,$C$,2\mathrm{.}58,0\mathrm{.}28,0\mathrm{.}63],[$Cereal$,$D$,1\mathrm{.}95,0\mathrm{.}44,0\mathrm{.}15]]$

Figure $1\mathrm{.}1$: Input File

By reading the input file that you have prepared, your program should be able to:

$($a$)$ Calculate the conversion of the nutrient values in ounce $($oz$)$ into gram $($g$),$ with two decimal places. Note: $1oz=28\mathrm{.}35g$

$($b$)$ Calculate the $\%$DV of each nutrient $($g$)$ for each cereal. Note: The daily recommended value for all three nutrients are as follows:

Carbohydrate $-300g,$ Protein $-50g,$ Fat $-65g$

$($c$)$ Calculate the average $\%DV$ of Carbohydrate, Protein and Fat for all cereals.

$($d$)$ Determine and display the category of each nutrient, either low, moderate or high.

$($e$)$ Output on screen: Ask the user to enter choice of nutrient $($carbohydrate$,$ protein, fat$)$ and level $($low$,$ moderate, high$)$ and display the food listed under that category $($e$.$g$.$ Figure $1\mathrm{.}2)$

Carbohydrate

Protein

Fat

Please enter your choice$>>2$

Low

Moderate

High

Please enter your choice $>3$

List of cereal$($s$)$ with high amount of protein:

Cereal B

Cereal D

Choose again? $\frac{Y}{N}N$

Figure $1\mathrm{.}2$: Screen output