Question

Question 4 [20 marks] Program development 4(a) Given the following description of a problem, identify the stages needed and generate the C code for the program. As an engineer, you have been asked to determine the mass in kilograms of a number of steel disks that your company is going to manufacture. The steel disks will be仁1.5cms in thickness and the radius of the disks varies from r"",-10 cms to r"-100 cms in cm increments. The parameters i, Imin, ar and t need to be inputted by the user. The density of the steel d=8030 kgs/m The format of the output should be as follows. Each row of the output must contain the details of a disk in the following format: r, t, density, mass including the commas (the intention is for the data to be read into a spreadsheet program. The first line must contain the results for the smallest radius and the last line contain the results for the largest radius. The output of the program is to be saved in a file "disks.csv". Use appropriate error checking to make sure you can write to the file. [4 marks for the program stages, 4 marks for appropriate variables and constants, 6 marks for the calculations, 2 marks for variable inputting and 4 marks for correct outputting to file, 20 marks in total].
answer question 4

In this question we have been asked to determine the mass in kilograms of a number of steel disks that your company is going to manufacture.

Answer 1

Please find the required C script as the following:

Note: The length units of 'cm' have been converted to 'meters' for all the variables.

//===============================================

#include<stdio.h>
#include<math.h>

#define PI 3.14159265358979323846

int main()
{
float t,d,r,mass;
FILE *f = fopen("disks.csv","w");
if (f == NULL)
{
printf("File not fount!!\n");
}
else
{
t = 0.015; // disk thickness in meter
d = 8030; // density
for(r=0.1;r<=1;r=r+0.02)
{
mass = d*(PI*r*r*t);
fprintf(f,"%f,%f,%f,%f\n",r,t,d,mass);
}
fclose(f);
}
return 0;
}

//===============================================

sample output:

0.1 0.015 80303.784048 0.12 0.015 80305.44903 0.14 0.015 8030 7.416735 0.16 0.015 8030 9.687163 0.18 0.015 8030 12.260315 0.2 0.015 8030 15.136191 0.22 0.015 8030 18.314791 0.24 0.015 803021.796114 0.26 0.015 8030 25.580164 0.3 0.015 803034.056438 0.32 0.015 8030 38.748661 0.34 0.015 803043.743607 0.36 0.015 8030 49.041279 0.38 0.015 8030 54.641674 0.4 0.015 803060.544792 0.42 0.015 803066.750633 0.44 0.015 8030 73.259201 0.46 0.015 803080.070496 0.48 0.015 803087.184509 0.5 0.015 8030 94.60125 0.52 0.015 8030 102.320702 0.54 0.015 8030 110.34288 0.56 0.015 8030 118.667778 0.58 0.015 8030 127.295403 0.6 0.015 8030 136.225754 0.62 0.015 8030 145.458817 0.64 0.015 8030 154.994614 0.66 0.015 8030 164.83313 0.68 0.015 8030 174.974365 0.7 0.015 8030 185.41832 0.72 0.015 8030 196.165009 0.74 0.015 8030 207.214417 0.76 0.015 8030 218.566559 0.78 0.015 8030 230.221405 0.8 0.015 8030 242.178986 0.82 0.015 8030 254.439285 0.84 0.015 8030 267.002319 0.86 0.015 8030 279.868073 0.88 0.015 8030 293.03653 0.9 0.015 8030 306.507721 0.92 0.015 8030 320.281647 0.94 0.015 8030 334.358276 0.96 0.015 8030 348.737671 0.98 0.015 8030 363.419739 1 0.015 8030 378.404541