Erro: Referenced in function _main

I've been working on this program and every time I run it I get two errors that say:

error LNK2019: unresolved external symbol _input_TempInfo referenced in function _main

error LNK2019: unresolved external symbol _input_Num_TempInfo referenced in function _main

Here's my code

Code:

---

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

struct TempInfo
{
    int day;
    double fahr;
    double celsius;
};

struct TempInfo input_TempInfo (void);
void print_TempInfo (struct TempInfo);
int input_Num_TempInfo (void);

int main (void)
{
    struct TempInfo temparray[20];
    int i, numTempInfo;

    numTempInfo = input_Num_TempInfo();

    printf ("Entering the %i temperature info \n", numTempInfo);
    for (i = 0; i < numTempInfo; i++)
    {
        temparray [i] = input_TempInfo();
    }

    return 0;
}

struct TempInfo input_Tempinfo (void)
{
    struct TempInfo hold;

    printf ("\nEnter in the day (1-366): ");
    scanf ("%i", &hold.day);

    while ((hold.day < 1) || (hold.day > 366))
    {
        printf ("\nDay is out of range, please re-enter: ");
        scanf ("%i", &hold.day);
    }

    printf ("Enter in the fahrenheit temperature");
    scanf ("%lf", &hold.fahr);
   
    hold.celsius = (hold.fahr - 32) * 5/9 ;

    return hold;

}

---

Any feedback would be great

Well, where is your implementation of input_Num_TempInfo()? You declare it and use it, but there is no implementation in the code you posted.

Edit: The other issue is related to spelling, you declare your function like this input_TempInfo, but the implementation is spelled like this: input_Tempinfo.

You don't have an implementation of input_TempInfo either. Check the spelling and case carefully.

Edit: Already covered.

Thanks for taking a look at my code. It runs like a champ now!