C - A structure can be created by using the malloc() function.

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Introduction

malloc() allocates enough storage for a structure. The size of the structure is determined by using the sizeof operator.

Demo

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 

int main() /*from   w w  w  . j av  a2  s .  c o m*/
{ 
   struct Product { 
       char symbol[5]; 
       int quantity; 
       float price; 
   }; 
   struct Product *purchase; 

/* Create structure in memory */ 
   purchase=(struct Product *)malloc(sizeof(struct Product)); 
   if(purchase==NULL) 
   { 
       puts("Some kind of malloc() error"); 
       exit(1); 
   } 

/* Assign structure data */ 
   strcpy(purchase->symbol,"ABCD"); 
   purchase->quantity=100; 
   purchase->price=801.19; 

/* Display database */ 
   puts("Investment Portfolio"); 
   printf("Symbol\tQuantity\tPrice\tValue\n"); 
   printf("%-6s\t%5d\t%.2f\t%.2f\n", 
           purchase->symbol, 
           purchase->quantity, 
           purchase->price, 
           purchase->quantity*purchase->price); 

   return(0); 
}

Result

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