selecting a word to do a calculation

piczim

I am wanting to write a simple bit of code that converts a currency into US$

I have managed thus far to get it to ask which currency I want to convert now I am not sure where to go from here

[code]#include
#include
int main()
{
char n1[20];// rand
char n2[20];// pounds
char n3[20];// yen

puts("What currency do you want to convert to US$:
");
scanf("%s",n1,n2,n3);
printf("
");
printf("You want to convert %s to US$
",n1,n2,n3);
printf("
");

return(0);
}[/code]