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You should review how to open a file.

After each loop "for" value "fact" not restart to 1.In addtion,the loop will run forever.

Explain to me why it is undefined behavior?.
fflush - C++ Reference

I'm sorry,but I want to study here!.Of course,I has learning in the forum of my native language.

Oh,I am sorry,I will notice after.Thanks you.

You include the library only once before main function and add prototype before using it in main.
Example:

//Include the library
#include <stdio.h>
//prototype of function
int transp();...

Error your basic.
Sorry my english is very bad!.

#include <stdio.h>
#include <conio.h>
#include <ctype.h>
void main()
{
int count=0;
char c;
printf("Enter a charracter:");
do
{

You forget that the library where the program?
Sorry my english is very bad.

Bool is a primitive data type as int,float.It only return two values:true or false.As in the:
while(goAgain) equivalent to while(goAgain==1) with goAgain variable declare bool data type.
Do I...

When using integer fraction will be truncated.
Solution:add .0 extentions for integer(example:47.0/15) or type casting it(example:sum=(float(47),15)).
Sorry my english is very bad!.