func, (prototype)

function with prototype
#include <stdio.h>
#include <math.h>

float OOO (float a, float b);


main()
{ float x,y,n;

printf("Vvedite A: ");
scanf("%f",&x);
printf("Vvedite B: ");
scanf("%f",&y);

n=OOO(x,y);
printf("N = %-5.1f\n\n",n);


printf("Vvedite A: ");
scanf("%f",&x);
printf("Vvedite B: ");
scanf("%f",&y);
n=OOO(x,y);
printf("N = %-5.1f",n);

}

//Ìîÿ ïåðâàÿ ôóíêöèÿ íà Ñ++
float OOO (float a, float b)
{ float c;
   c=sqrt(a*a+b*b)/log(a+b);
   return(c);
}