Here i have correct your program, I hope it will satisfied you
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
//declaration
void head( );
float convert (float);
void main() //main
{
float dollar, peso;
head();
printf ("\n\tPlease enter the dollar: $"); scanf("%f",&dollar);
peso = convert(dollar); //function calling with argument dallar
//You have to pass dollar variable to fuction so fuction can calculate it
printf("\n\n\t\t$%.2f is equal to PH%.2f pesos.", dollar, peso);
getch();
}
void head ()
{
printf ("\n\t\t<<Function to convert dollars to pesos using function.>>\n");
}
float convert(float d)
{
float p;
p = d*46; //computation to convert dollar to peso
// Here, you are simply setting p to 46. You want to use the passed argument;
p = d * 46.00;
return p; // returns the value of p to main function which will be stored in
peso
}
