#include <stdio.h>

#include <stdlib.h>

void getinput(char *prmpt, float *x, float *y, float *z);

main()

{

char ans, buf[10];

float x1, x2, x3, sum;

do {

getinput("Input three numbers: ", &x1, &x2, &x3);

sum = x1 + x2 + x3;

printf("The sum is %f\n", sum);

printf("Go again? ");

gets(buf);

ans = toupper(*buf);

} while(ans == 'Y');

return 0;

}

void getinput(char *prmpt, float *x, float *y, float *z)

{

char buf[80];

printf(prmpt);

gets(buf);

sscanf(buf, "%f %f %f", x, y, z);

}