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Pointers program using Dynamic Memory Allocation

Discussion in 'C' started by KingJames603, Aug 28, 2010.

  1. KingJames603

    KingJames603 New Member

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    On the payroll pointers program, I am struggling with a few things on the program.

    The data from the terminal uses malloc, for an employee node. Dynamic Memory Allocation is used in the program.

    For the name of each employee I can put in the First Name or First and Last Name together as one word, but if I put them as separate words it just gives me the first name and doesn't let the user enter the rest of the information requested by the program. When I select, a option for would you like to add another employee (y/n) I get a error dialog box debug error, Run-Time Check Failure #3- The variable 'num_emp' is being used without being initialized. What do they mean by used with being initialized? I don't know what they mean by unreferenced local variable. Any solutions that would fix the errors in the program?


    Code:
    #include "stdio.h"
    #include "stdlib.h"
    
    #define CHAR_SIZE 20
    #define STD_HOURS 40.0
    #define MAX_HOURS 158.0
    #define OT_RATE   1.5
    
    struct employee
    {
      char  name[CHAR_SIZE];
      long  id_number;
      float wage;
      float hours;
      float overtime;
      float ot_pay;
      float gross_pay;
      float Gross;
    
      struct employee *next;
    };
    
    
    // Function gets hours for each employee
    
    
    float CalcOT(float hours)
    {
        /*  test to see if any overtime was worked  */
            if (hours > STD_HOURS)
                    return (hours - STD_HOURS);
            else  /*  no overtime was worked  */
                    return (0.0);
    }
    
    float CalcOverPay (wage, ot_hrs)
    
    float wage, ot_hrs;
    
        {
        float ot_rate,    /* ther rate the overtime is based on, such as */
                          /* time and a half                             */
              ot_pay;     /* The amount of pay that is from overtime     */
    
        /*  calculate the overtime pay  */
        ot_pay = ot_hrs * (wage * OT_RATE);
    
        /*  return the overtime pay to the calling function  */
        return (ot_pay);
    
        }  /*  end of function over_pay  */
    
    float CalcGross(float hours, float wage, float overtime)
    {
            float Gross;
    
            /* check for overtime and calculate gross*/
            if (overtime > 0) {
                    Gross = (STD_HOURS * wage) /* regular pay */
                        + (overtime * OT_RATE * wage);     /* ot pay */
            } /* if */
            else  /* not ot */
            {
                    Gross = wage * hours;
            } /* else */
    
            return (Gross);
    } /* CalcGrossPay */
    
    
    
    void print_list(emp1)
    struct employee *emp1;
    {
            struct employee *tmp; /* tmp pointer value to current node */
            int i = 0;            /* counts the nodes printed          */
    
            printf ("\n------------------------------------------------------------\n");
            printf ("  Name          Clock#       Wage     Hours    OT    Gross Pay\n");
            printf ("--------------------------------------------------------------\n");
    
            /* Start a beginning of list and print out each value               */
            /* loop until tmp points to null (remember null is 0 or false)      */
            for(tmp = emp1; tmp ; tmp = tmp->next)
            {
                i++;
    
    
    
                printf("%-15s, %6d,  $%6.2f   %.1f   %5.2f   $%6.2f\n",tmp->name, tmp->id_number,
                                                          tmp->wage, tmp->hours, tmp->ot_pay, tmp->gross_pay);
            }
    
            printf("\n\nTotal Number of Employees = %d\n", i);
    
    }
    
    /* end declarations */
    
    
    
    int main()
    {
            char   answer[80];
        int    more_data = 1;
            char   value;
            struct employee *emp_ptr;     /* always pointer to the first node */
        struct employee *temp_ptr;    /* points to the current node       */
        float ot_pay;                 /* overtime pay                     */
        int i,                        /* loop counter                     */
            num_emp;                  /* total number of employees        */
    
        struct employee *current_ptr, /* pointer to current node */
                        *head_ptr;    /* always points to first node */
    
        /* Set up storage for first node */
        head_ptr = (struct employee *) malloc (sizeof(struct employee));
        current_ptr = head_ptr;
    
        while (more_data)
            {
    
            printf("\nEnter employee name: ");
                    scanf("%s", & current_ptr -> name);
    
                    printf("\nEnter employee ID: ");
                    scanf("%d", & current_ptr -> id_number);
    
            printf("\nEnter employee wage: ");
                    scanf("%f", & current_ptr -> wage);
    
                    printf("\nEnter hours worked for week: ");
                    scanf("%f", & current_ptr -> hours);
    
                printf("Would you like to add another employee? (y/n): ");
                scanf("%s", answer);
    
            /*  loop for each employee  */
            for(i=0; i < num_emp; ++i)
                {
                /*  initialize the overtime pay  */
                ot_pay = 0.0;
    
                /*  test to see if the employee worked any overtime  */
                if(temp_ptr->hours > STD_HOURS)
                    {
                    /*  call local function to calculate the overtime hours  */
                    temp_ptr->overtime = CalcOT(temp_ptr->hours);
    
                    /*  call local function to calculate the overtime pay  */
                    ot_pay = CalcOverPay(temp_ptr->wage, temp_ptr->overtime);
                    }
                else 
                    {
                    temp_ptr->overtime = 0.0;
                    }  /*  end of if statement  */
    
                /*  call local funcion to calculate the gross pay  */
                temp_ptr->Gross = CalcGross (temp_ptr->wage,temp_ptr->hours,ot_pay);
                /*  move temporary pointer to next node in the linked list  */
                temp_ptr = temp_ptr->next;
    
                }  /*  end of for loop  */
    
            /* Ask user if they want to add another employee */
            if (value = toupper(answer[0]) != 'Y')
               {
               current_ptr->next = (struct employee *) NULL;
               more_data = 0;
               }
            else
               {
               /* set the next pointer of the current node to point to the new node */
               current_ptr->next = (struct employee *) malloc (sizeof(struct employee));
               /* move the current node pointer to the new node */
               current_ptr = current_ptr->next;
               }
    
            }
    
        /* print out listing of all employee id's and wages that were entered */
        print_list(head_ptr);
    
       printf("\n\nEnd of program\n");
       return 0;
     
    
    
            return 0;
    
    
    }
    /* main */1>------ Build started: Project: PayrollPointers, Configuration: Debug Win32 ------
    1>Compiling...
    1>payroll.c
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(46) : warning C4244: 'return' : conversion from 'double' to 'float', possible loss of data
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(61) : warning C4244: '=' : conversion from 'double' to 'float', possible loss of data
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(56) : warning C4101: 'ot_rate' : unreferenced local variable
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(75) : warning C4244: '=' : conversion from 'double' to 'float', possible loss of data
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(139) : warning C4996: 'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
    1> c:\program files (x86)\microsoft visual studio 9.0\vc\include\stdio.h(306) : see declaration of 'scanf'
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(142) : warning C4996: 'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
    1> c:\program files (x86)\microsoft visual studio 9.0\vc\include\stdio.h(306) : see declaration of 'scanf'
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(145) : warning C4996: 'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
    1> c:\program files (x86)\microsoft visual studio 9.0\vc\include\stdio.h(306) : see declaration of 'scanf'
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(148) : warning C4996: 'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
    1> c:\program files (x86)\microsoft visual studio 9.0\vc\include\stdio.h(306) : see declaration of 'scanf'
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(151) : warning C4996: 'scanf': This function or variable may be unsafe. Consider using scanf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
    1> c:\program files (x86)\microsoft visual studio 9.0\vc\include\stdio.h(306) : see declaration of 'scanf'
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(181) : warning C4013: 'toupper' undefined; assuming extern returning int
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(122) : warning C4101: 'emp_ptr' : unreferenced local variable
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(154) : warning C4700: uninitialized local variable 'num_emp' used
    1>f:\c programming\payrollpointers\payrollpointers\payroll.c(160) : warning C4700: uninitialized local variable 'temp_ptr' used
    1>Linking...
    1>Embedding manifest...
    1>Build log was saved at "file://f:\C Programming\PayrollPointers\PayrollPointers\Debug\BuildLog.htm"
    1>PayrollPointers - 0 error(s), 13 warning(s)
    ========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
     

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