Thread: Complex numbers and C structures

hello, i just began studying C structures and i got an exercice at the first days so i'm still not familiar with it. can anyone plz help.

The problem is as following:. Represent complex numbers )
• Implement all 4 functions (absolute value, addition, multiplication, negation)
• Do this in two different ways, using:
- Arrays(how can i do this?)
- Structures

I hope someone can help me with that

Normally classes have some kind of instruction leading up to an assignment, or they have a text-book that you can read to learn how to use the material.

I would suggest that you start by looking at your notes or reading the book. That's a great place to get started. Then once you have your program written, this forum exists to help you debug it. However, we cannot help you until you have tried to solve the problem on your own.

well i tried to do the addition fuction with typedef

Code:

#include<stdio.h>  
  
   
 struct Complex {  
     float real;  
     float img;  
 };  
   
  
 Complex add_complex( Complex z1, Complex z2 ) {  
   Complex z3;  
   z3.real = z1.real + z2.real;  
   z3.img  = z1.img  + z2.img;  
   return z3;  
 }  
   
 int main() {  
   Complex z1, z2, z3;  
   
    
   printf( "Enter the first complex number \n");  
   printf( "Enter the real part " );  
   scanf( "&#37;f", &z1.real );  
   printf( "Enter the imaginary part " );  
   scanf( "%f", &z1.img );  
   
    
   printf( "Enter the second complex number \n");  
   printf( "Enter the real part " );  
   scanf( "%f", &z2.real);  
   printf( "Enter the imaginary part " );  
   scanf( "%f", &z2.img );  
   
   z3 = add_complex( z1, z2 );  
   //show the sum  
   printf( "sum: %f + i * %f", z3.real, z3.img );  
   
   getchar();    
   return 0;     
 }

Well, you need a typedef, if that's what you mean. struct Complex just defines a new type called "struct Complex" -- if you want Complex, that's where the the typedef comes in. But I don't see anything (else) wrong here.

yes it runs normally, however i don't know how to do it with arrays if this questions can be answered plz help

My best guess would be that your instructor wants you to use

float complex[2];

for an array implementation of complex numbers.

i see that make thing visual for me thanks i'll get to work now thanks

hello guys i got this exercice in which i need help. This program should fill two arrays made of information about students and employee. i have to sort alphabetically each of them by name and last name, still i have to check that no name should be repeated. In this program i tried to store the information in a table string"std" and in the same time check for any repeated name but i have problem with the sorting and when i run this it shuts down as the size ins't recognized even if i specified it.

Code:

#include <stdio.h>
#include <conio.h>
#include <string.h>
#define SIZE 10; 
typedef struct {
         char *firstname;
         char *lastname;
         float grade;
         }student;
         
typedef struct {
        char *lastname;
        char *firstname;
        float salary;
        }employee;
void fill_1(student []);        
void fill_s(student);
void fill_2(employee *);
void fill_e(employee []);
int search(student [],student );
int main()
{
    student s[10];
    student std;
    fill_1(s);
    
    }










void fill_e(employee *e)
{
     printf("please enter first name");
     scanf("&#37;s",&e->firstname);
     printf("please enter last name");
     scanf("%s",&e->lastname);
     printf("please enter grade");
     scanf("%f",&e->salary);
     
     } 




void fill_s(student *s)
{
     printf("please enter first name");
     scanf("%s",&s->firstname);
     printf("please enter last name");
     scanf("%s",&s->lastname);
     printf("please enter grade");
     scanf("%f",&s->grade);
     
     }        


void fill_1(student s[])
{
     int i=0,test;
     student std;
     fill_s(&std);
     s[0]=std;
     
    
      do{
          fill_s(&std);
          if(search(s,std)==1) printf("no");  
           else s[i+1]=std;
                  
           i++;
           printf("entrez 0,1");
           scanf("%d", &test);   
             
             
            }while((i<10)&&(test==1));
                     
}

 
 
 void fill_2(employee e[])
{
   int i=0,test; 
    do 
       { 
          fill_e(&e[i]);
          printf("if you want to add another employee press 1 else press 0");
          scanf ("%d",&test);                 
          i=i+1;
          }while((i<10)&&(test==1));                      
 
}
 int search(student s[],student std)
 {
     
     for(int i=0;i<10;i++)
     {
         if ((strcmp(s[i].firstname,std.firstname)==0) && (strcmp(s[i].lastname,std.lastname)==0))    
             return 1;
             
     
     
     } return 0;}

i get many errors for sure