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/*    This program written by:    Zachary Easterbrook    Date: 27-10-2010    Lecture: 60-140-1    Lab: 60-140-52    Student ID: 103163420    I confirm that I will keep the content of this assignment/examination confidential.    I confirm that I have not received any unauthorized assistance in preparing for or    doing this assignment/examination. I confirm knowing that a mark of 0 may be assigned    for copied work.*/#include <stdio.h>#include <math.h>// I felt like doing this.#define PI 3.142// Global input variablesint qnt1, qnt2, qnt3, qnt4;double thick1, thick2, thick3, thick4;double inner_d1, inner_d2, inner_d3, inner_d4;double outer_d1, outer_d2, outer_d3, outer_d4;double density1, density2, density3, density4;// Global output variablesdouble area1, area2, area3, area4;double weight1, weight2, weight3, weight4, total_weight;// Function prototypesdouble WasherWeight(void);double CircleArea(void);void PrintWeights(void);int main(){			printf("Enter the quantity, thickness, density, inner diameter, and outer diameter of Washer Type A :\n");	scanf("%d %lf %lf %lf %lf", &qnt1, &thick1, &density1, &inner_d1, &outer_d1);	printf("Enter the same for type B : \n");	scanf("%d %lf %lf %lf %lf", &qnt2, &thick2, &density2, &inner_d2, &outer_d2);	printf("Enter the same for type C : \n");	scanf("%d %lf %lf %lf %lf", &qnt3, &thick3, &density3, &inner_d3, &outer_d3);	printf("Enter the same for type D : \n");	scanf("%d %lf %lf %lf %lf", &qnt4, &thick4, &density4, &inner_d4, &outer_d4);	CircleArea();	WasherWeight();	total_weight = weight1 + weight2 + weight3 + weight4;		PrintWeights();}double CircleArea(void){	area1 = (pow((outer_d1 / 2), 2) * PI) - (pow((inner_d1 / 2), 2) * PI);	area2 = (pow((outer_d2 / 2), 2) * PI) - (pow((inner_d2 / 2), 2) * PI);	area3 = (pow((outer_d3 / 2), 2) * PI) - (pow((inner_d3 / 2), 2) * PI);	area4 = (pow((outer_d4 / 2), 2) * PI) - (pow((inner_d4 / 2), 2) * PI);}double WasherWeight(void){	weight1 = qnt1 * thick1 * density1 * area1;	weight2 = qnt2 * thick2 * density2 * area2;	weight3 = qnt3 * thick3 * density3 * area3;	weight4 = qnt4 * thick4 * density4 * area4;}void PrintWeights(void){	printf("WasherType\tQty\tThickness   Density\tWeight\n");	printf("A\t\t%d\t%.2lf\t    %.2lf\t%.2lf\n", qnt1, thick1, density1, weight1);	printf("B\t\t%d\t%.2lf\t    %.2lf\t%.2lf\n", qnt2, thick2, density2, weight2);	printf("C\t\t%d\t%.2lf\t    %.2lf\t%.2lf\n", qnt3, thick3, density3, weight3);	printf("D\t\t%d\t%.2lf\t    %.2lf\t%.2lf\n", qnt4, thick4, density4, weight4);	printf("*********************************************** %.2lf\n", total_weight);}