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i have a question, why can't i do this, there are three errors and i don't know what they mean

```
#include<iostream.h>
float celsius_to_fahrenheit(float);
int main()
{
float fahrenheit;
float celsius=22.5;
fahrenheit=celsius_to_fahrenheit(celsius);
cout<<celsius<<"C="<<fahrenheit<<"F\n";
return 0;
}
celsius_to_fahrenheit(float celsius)
{
return(celsius*(9.0/5.0)+32.0);
}
```