wtf?

hey all, im a newfag at programming and im taking a year one programming course at the university, (im year 3 maths) and i need sone help i have no idea wtf to do and my teacher speaks borderline english.

i need to make this program below using call by referance instead of call by value, i have no idea how to do this, so if anone could get me started,,, or anything i would really appriciate it =)



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

double washerweight(int, double, double, double, double, double);
double circlearea(double, double);
void printweight(char, int, double, double, double);

void main(void)
{

double washer1 = 'A', washer2 = 'B', washer3 = 'C', washer4 = 'D';
int q1, q2, q3, q4;
double t1, t2, t3, t4;
double d1, d2, d3, d4;
double dA1, dA2, dB1, dB2, dC1, dC2, dD1, dD2;
double pi = 3.14159265;

double weight1, weight2, weight3, weight4;
double total_weight;
double area1, area2, area3, area4;

printf("Enter quantity, thickness, density, inner diameter, outer diameter of Washer Type A : \n");
scanf("%d %lf %lf %lf %lf", &q1, &t1, &d1, &dA1, &dA2);
printf("Enter quantity, thickness, density, inner diameter, outer diameter of Washer Type B : \n");
scanf("%d %lf %lf %lf %lf", &q2, &t2, &d2, &dB1, &dB2);
printf("Enter quantity, thickness, density, inner diameter, outer diameter of Washer Type C : \n");
scanf("%d %lf %lf %lf %lf", &q3, &t3, &d3, &dC1, &dC2);
printf("Enter quantity, thickness, density, inner diameter, outer diameter of Washer Type D : \n");
scanf("%d %lf %lf %lf %lf", &q4, &t4, &d4, &dD1, &dD2);

weight1 = washerweight(q1, t1, d1, dA1, dA2, pi);
weight2 = washerweight(q2, t2, d2, dB1, dB2, pi);
weight3 = washerweight(q3, t3, d3, dC1, dC2, pi);
weight4 = washerweight(q4, t4, d4, dD1, dD2, pi);
total_weight = weight1 + weight2 + weight3 + weight4;

printf("Washer Type \t Qty \t Thickness \t Desity \t Weight \n ") ;
PrintWeight(washer1, q1, t1, d1, weight1);
PrintWeight(washer2, q2, t2, d2, weight2);
PrintWeight(washer3, q3, t3, d3, weight3);
PrintWeight(washer4, q4, t4, d4, weight4);
printf("********************************************** \t %0.2f \n", total_weight);
}

double washerweight(int q, double t, double d, double d1, double d2, double pi)
{
double area, iarea, oarea, weight;
oarea = circlearea(&d2,pi);
iarea = circlearea(&d1, pi);
area = oarea - iarea;
weight = q * t *d * area;
return (weight);
}

double circlearea(double d, double pi)
{
double rad;
rad = d/2.0;
return (pi * rad * rad);
}

void printweight(char washer, int q, double t, double d, double weight)
{
printf("%c \t \t %d \t %0.2lf \t \t %0.2lf \t %0.2lf \n ", washer, q, t, d, weight) ;
}


#include <stdio.h>
#include <math.h> /* useless to include if you don't use M_PI, other macros and/or functions */

double washer_weight(int* q_ptr, double* t_ptr, double* d_ptr, double* d1_ptr, double* d2_ptr, double* pi_ptr);
double circle_area(double* d_ptr, double* pi_ptr);
void print_weight(char* washer_ptr, int* q_ptr, double* t_ptr, double* d_ptr, double* weight_ptr);

/* (1). extend your program for n washers instead of 4 */
/* (2). coffee */
/* (3). I hope you get the point(er), get it? */
int main(void)
{
    double washer1 = 'A', washer2 = 'B', washer3 = 'C', washer4 = 'D'; /* aw what the fuck */
    int q1, q2, q3, q4;
    double t1, t2, t3, t4;
    double d1, d2, d3, d4;
    double dA1, dA2, dB1, dB2, dC1, dC2, dD1, dD2;
    double pi = 3.14159265; /* double pi = M_PI; */

    double weight1, weight2, weight3, weight4;
    double total_weight;
    double area1, area2, area3, area4;

    printf("Enter quantity, thickness, density, inner diameter, outer diameter of Washer Type A : \n");
    scanf("%d %lf %lf %lf %lf", &q1, &t1, &d1, &dA1, &dA2);
    printf("Enter quantity, thickness, density, inner diameter, outer diameter of Washer Type B : \n");
    scanf("%d %lf %lf %lf %lf", &q2, &t2, &d2, &dB1, &dB2);
    printf("Enter quantity, thickness, density, inner diameter, outer diameter of Washer Type C : \n");
    scanf("%d %lf %lf %lf %lf", &q3, &t3, &d3, &dC1, &dC2);
    printf("Enter quantity, thickness, density, inner diameter, outer diameter of Washer Type D : \n");
    scanf("%d %lf %lf %lf %lf", &q4, &t4, &d4, &dD1, &dD2);

    weight1 = washer_weight(&q1, &t1, &d1, &dA1, &dA2, &pi);
    weight2 = washer_weight(&q2, &t2, &d2, &dB1, &dB2, &pi);
    weight3 = washer_weight(&q3, &t3, &d3, &dC1, &dC2, &pi);
    weight4 = washer_weight(&q4, &t4, &d4, &dD1, &dD2, &pi);
    total_weight = weight1 + weight2 + weight3 + weight4;

    printf("Washer Type \t Qty \t Thickness \t Desity \t Weight \n ") ;
    print_weight(&washer1, &q1, &t1, &d1, &weight1);
    print_weight(&washer2, &q2, &t2, &d2, &weight2);
    print_weight(&washer3, &q3, &t3, &d3, &weight3);
    print_weight(&washer4, &q4, &t4, &d4, &weight4);
    printf("********************************************** \t %0.2f \n", total_weight);

    return 0;
}

double washer_weight(int* q, double* t, double* d, double* d1, double* d2, double* pi)
{
    auto double iarea = circle_area(d1,pi), oarea = circle_area(d2,pi), area = oarea - iarea;
    return (*q)*(*t)*(*d)*area;
}

double circle_area(double* d, double* pi)
{
    auto double rad = (*d)/2.0;
    return (*pi)*rad*rad;
}

void print_weight(char* washer, int* q, double* t, double* d, double* weight)
{
    printf("%c \t \t %d \t %0.2lf \t \t %0.2lf \t %0.2lf \n ", *washer, *q, *t, *d, *weight) ;
}

>>6
My good sir, I must commend you for your majestic use of words. It was a splendid display of using your intellect to get your point across. If only the poser who originally stared this thread had posed his question with equal splendor, the masters here surely would have shared their knowledge of the arts.

>>5
double washer1 = 'A', washer2 = 'B', washer3 = 'C', washer4 = 'D';
auto double
wtf, OP

C is always pass by value. Get over it, ``faggot''.