Function Stubs Functions int initializeItem(Item * pItem, char * strName, char *

Question

• Function Stubs
  •   
  • Functions
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    •    
    • int        initializeItem(Item * pItem, char * strName, char * strDescription, int        iQuantity, int iPrice)
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      •     
      • Fills         the given item with the given values.
      •     
      • Constraints:
      •     
        •      
        • pItem,          strName, and strDescription cannot be NULL
        •      
        • iQuantity          and iPrice must be >= 0
        •     
      •     
      • Return         0 on success or an error code if there is a problem (i.e. a constraint         is not met).
      •    
    •    
    • void        printItem(Item item)
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      •     
      • Prints         the fields in the given item, one field per line.
      •     
      •    
    •    
    • int        addItem(Inventory * pInventory, char * strName, char * strDescription,        int iQuantity, int iPrice)
    •    
      •     
      • Adds         a new Item with the given values to the end of the Inventory's items         array.
      •     
      • Constraints:
      •     
        •      
        • The          new Item should have the same constraints as discussed in the          initializeItem function.
        •      
        • pInventory          cannot be NULL.
        •      
        • If          the inventory is full, do not add the item and return a error code.
        •      
        • If          an item with the same name exists in the Inventory, do not add the          item and return an error code.
        •     
      •     
      • Make         sure that you update the iCurrentSize.
      •     
      • Return         0 on success or an error code if there is a problem (i.e. a constraint         is not met).
      •    
    •    
    • Item        * findItem(Inventory * pInventory, char * strName)
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      •     
      • Searches         the Inventory for an item with the given name and returns a pointer to         that item.
      •     
      • Return         a pointer to the found Item or a NULL pointer if it was not found (or         there was an error).
      •    
    •    
    • int        removeItem(Inventory * pInventory, char * strName)
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      •     
      • Removes         the Item with the given name from the given inventory.
      •     
      • If         the Item is not at the end of the array, shift all Items after it down         to fill the empty space.
      •     
      • Make         sure that you update the iCurrentSize.
      •     
      • Return         0 if the Item was successfully removed or if it does not exist in the         Inventory.
      •     
      • Return         an error code if there was a problem .
      •    
    •   

Explanation / Answer

/*Functions required*/

int initializeItem(Item * pItem, char * strName, char * strDescription, int iQuantity, int iPrice){
    if(pItem==NULL ||strName==NULL || strDescription==NULL){
        printf("strName, and strDescription cannot be NULL "); return;
    }
    if(iQuantity<0 || iPrice<0){
        printf("iQuantity and iPrice must be >= 0 "); return;
    }
    //assigning values to pItem attributes
    strcpy((*pItem).strName,strName);
    strcpy((*pItem).strDescription,strDescription);
    (*pItem).iQuantity=iQuantity;
    (*pItem).iPrice=iPrice;
    return 0;
}
   
void printItem(Item item){
    if(&item!=NULL){
        printf("strName = %s strDescription= %s iQuantity = %d iPrice = %d ",item.strName,item.strDescription,item.iQuantity,item.iPrice);
    }
}

Item * findItem(Inventory * pInventory, char * strName){
    int i;
    for(i=0;i<(*pInventory).iCurrentSize;i++){
        if(strcmp((*pInventory).items[i].strName,strName)==0){
            Item *x;
               x = (Item*)malloc( sizeof( Item ) );
               x = &(*pInventory).items[i];
            return x;
        }
    }
    return NULL;
}

int addItem(Inventory * pInventory, char * strName, char * strDescription, int iQuantity, int iPrice){
    if(strName==NULL || strDescription==NULL){
        printf("strName, and strDescription cannot be NULL "); return;
    }
    if(iQuantity<0 || iPrice<0){
        printf("iQuantity and iPrice must be >= 0 "); return;
    }
    if(pInventory==NULL){
        printf("pInventory cannot be NULL "); return;
    }
    if((*pInventory).iCurrentSize==(*pInventory).iMaxSize){
        printf("Inventory is full, can't add item to it "); return;
    }
    if( findItem(pInventory,strName)!=NULL ){
        printf("Item already exist in the inventory "); return;
    }
    strcpy((*pInventory).items[(*pInventory).iCurrentSize].strName,strName);
    strcpy((*pInventory).items[(*pInventory).iCurrentSize].strDescription,strDescription);
    (*pInventory).items[(*pInventory).iCurrentSize].iQuantity=iQuantity;
    (*pInventory).items[(*pInventory).iCurrentSize].iPrice=iPrice;
    (*pInventory).iCurrentSize++;
    return 0;
}


int removeItem(Inventory * pInventory, char * strName){
    int i,j;
    int found=0;
    for(i=0;i<(*pInventory).iCurrentSize;i++){
        if(strcmp((*pInventory).items[i].strName,strName)==0){
            found=1;break;
        }
    }
    if(found==0){
        printf("Item doesn't exist in the inventory "); return 0;
    }
    else{
        printf("%d ",i);
        // shifting all the elements ahead of removed element towards left
        for(j=i;j<(*pInventory).iCurrentSize;j++){
            (*pInventory).items[j]=(*pInventory).items[j+1];
        }
        (*pInventory).iCurrentSize--;
        return 0;
    }
}

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