New to C Programming and Need Help

Hey guys/gals,

I am new to programming and have a class assignment. I am trying to make these functions within functions work right. They compile just fine, but when I run the program it does not work. I do not need someone to completely do my problem for me, but if you could suggest on one of my functions what I am doing wrong I will change the others. I have looked all over google trying to figure this out. Here is my source code please let me know what I need to change.

Thanks!

Bryce

Code:

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

#define minhour 60 /*Minutesd in an Hour*/
#define ltoml 1000 /*Liters to Milliliters*/

int main(void)
{
    float rateml = 0, ratemg = 0, rateunit = 0, hour = 0, dropfactor = 0, patient = 0,
    conml = 0, conunit = 0;       /* The options */
    int menu;                     /* Menu Options */
    float total1, total2, total3, total4; /* The totals */

while(menu !=5)
{      
    
int get_problem();

switch (menu)                  /* select the type of option */
{
    case 1:void get_rate_drop_factor();
         
         break;
    
    case 2: void get_liter_per_hour();
         
         break;

    case 3: void get_kg_rate_conc();
         
         break;
        
    case 4: void get_units_conc();
         
         break; 
    
    default: printf("\n***Invalid option selected***\n");
    
}
{  
if (menu == 1)    

    printf("The drop rate per minute is %.0f\n", total1);    

else if (menu == 2)

    printf("The rate in milliliters per hour is %.0f\n", total2);    

else if (menu == 3)

    printf("The rate in milliliters per hour is %.0f\n", total3);
    
else if (menu == 4)

    printf("The rate in milliliters per hour is %.0f\n", total4);            
}
}
return (0);
}

/* Main Menu */
int get_problem();

int get_problem(int menu)
{
    printf("\n\nIntravenous Rate Assistant\n");
    printf("\n\nWhat would you like to do?\n\n");    /* WRITE instructions */
    printf("\t1 = ml/hr & Tubing Drop Factor\n");
    printf("\t2 = 1 L for n Hour\n");
    printf("\t3 = mg/kg/hr & Concentration in mg/ml\n");
    printf("\t4 = units/hr & Concentration in units/ml\n");
    printf("\t5 = QUIT\n");

    printf("\n\nEnter the problem you wish to solve:");
    scanf("%d",&menu);                   /* Read menu option */
}

/* Case 1 */
void get_rate_drop_factor(float);

void get_rate_drop_factor(float rateml, float dropfactor, float total1)
{
     printf("Enter rate in ml/hr:");
         scanf("%f", &rateml);
         printf("Enter tubing's drop factor (drops/ml):");
         scanf("%f", &dropfactor);
         total1 = ((dropfactor * rateml) / minhour);
         }
         
/* Case 2 */         
void get_liter_per_hour(float);

void get_liter_per_hour(float hour, float total2)
{
     printf("Enter number of hours:");
         scanf("%f", &hour);
         total2 = (ltoml / hour);
         }         

/* Case 3 */        
void get_kg_rate_conc(float); 

void get_kg_rate_conc(float ratemg, float patient, float conml, float total3)
{
     printf("Enter rate in mg/kg/hr:");
         scanf("%f", &ratemg);
         printf("Enter patient weight in kg:");         
         scanf("%f", &patient);         
         printf("Enter concentration in mg/ml:");                  
         scanf("%f", &conml);         
         total3 = (ratemg * conml * patient);
         }

/* Case 4 */
void get_units_conc(float);

void get_units_conc(float rateunit, float conunit, float total4)
{
     printf("Enter rate in units/hr:");         
         scanf("%f", &rateunit);         
         printf("Enter concentration in units/ml:");                  
         scanf("%f", &conunit);                  
         total4 = (rateunit / conunit);
         }

what compiler are you using? you need to turn up your warning levels.