Thread: Having a ||CLANG: Error: linker command failed with exit code 1||

gcc error message looks like this:

Code:

 gcc k-hw1.c -lm -Wall -WerrorUndefined symbols for architecture x86_64:
  "_Comm", referenced from:
      _main in t-ebc1-ff9c31.o
  "_Ind", referenced from:
      _main in k-ebc1-ff9c31.o
  "_Res", referenced from:
      _main in k-ebc1-ff9c31.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation) 

This is my first time ever coding and I've been scratching my head at this problem for as good couple of hours and I have no idea what I am doing at this point.

The code I used was this:

Code:

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




int menu();
int Res();
int Comm();
int Ind();




int main ()
{
{
int menu ();
}
        int conType;




         {
        printf("******Electricity Bill Calculator******\n\n");
        printf("1. Residential\n");
        printf("2. Commercial\n");
        printf("3. Industial\n\n");
        printf("0. quit program\n\n");
        printf("Choose the type of connection: \n");
        scanf("%d", &conType);
do
        switch (conType)
        {
        case 1: Res();
        break;




        case 2: Comm();
        break;




        case 3: Ind();
        break;




        default:
        printf("Invalid Choice! Please enter a valid choice: \n");
        break;
        }
        while (conType != 0);
         }
int Res();


        int unit, enCharge, total;
        float cuCharge;        printf("Enter the number of units (in kWh): \n");
        scanf("%d", &unit);


if (unit>=0 && unit<=300)
        {
        enCharge=unit*.075;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }


else if (unit>=301 && unit<=750)


        {
        enCharge=unit*.10;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }


else if (unit>=751 && unit <=1550)


        {
        enCharge=unit*.1350;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }


else if (unit>1501)


        {


        enCharge=unit*.15;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }


int Comm();


if (unit>=0 && unit<=300)
        {
        enCharge=unit*.300;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }


else if (unit>=301 && unit<=750)


        {
      enCharge=unit*.14;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }


else if (unit>=751 && unit <=1550)


        {
        enCharge=unit*.1750;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }


else if (unit>1501)


        {


        enCharge=unit*.20;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }


int Ind();


if (unit>=0 && unit<=300)
        {
        enCharge=unit*.36;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }


else if (unit>=301 && unit<=750)


        {
        enCharge=unit*.40;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }


else if (unit>=751 && unit <=1550)


        {
        enCharge=unit*.4550;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }
else if (unit>1501)


        {


        enCharge=unit*.50;
        cuCharge=unit/(float)10;


        total = enCharge+cuCharge;
        }


printf("Total Amount = %d", total);


exit (0);
}

You declared the functions named Res, Comm and Ind, but you did not define (implement) them.

Anyway, you need to indent your code properly.