I want to input character and integers by scanf into a structure - c++

Question

Ok, so I'd like to input a one-letter character and three numbers into a structure using scanf, and I want to print all four of them by using a function that prints it. But everytime i run it i get errors saying that i can't run it, or sometimes it prints everything right except the character part, where it would just go as blank.. what could be possibly wrong with this??
#include <stdio.h>
struct Score
{
char a;
float x, y, z;
};
void main(void)
{
void avg(char *a, float x, float y, float z);
char a1 = 'b';
float x1 = 0, y1 = 0, z1 = 0;
printf("enter an alphaber\n");
fflush(stdin);
scanf_s("%c", &a1);
printf("enter three numbers (ex:1,2,3)\n");
fflush(stdin);
scanf_s("%f,%f,%f", &x1, &y1, &z1);
struct Score s1 = { a1, x1, y1, z1 };
avg(s1.a, s1.x, s1.y, s1.z);
}
void avg(char *a, float x, float y, float z)
{
printf("%c (%f,%f,%f) \n", a, x, y, z);
}

Answer 1

The signature of avg() is wrong. The first argument should be not char* but char.
Because I hate MSVC-specific code, your code should be like this.
Note that you should check whether readings are successful.
#include <stdio.h>
struct Score
{
char a;
float x, y, z;
};
int main(void)
{
/* declareing function inside function is unusual, but not bad */
void avg(char a, float x, float y, float z);
char a1 = 'b';
float x1 = 0, y1 = 0, z1 = 0;
printf("enter an alphaber\n");
if (scanf("%c", &a1) != 1) {
puts("read error");
return 1;
}
printf("enter three numbers (ex:1,2,3)\n");
if (scanf("%f,%f,%f", &x1, &y1, &z1) != 3) {
puts("read error");
return 1;
}
struct Score s1 = { a1, x1, y1, z1 };
avg(s1.a, s1.x, s1.y, s1.z);
}
void avg(char a, float x, float y, float z)
{
printf("%c (%f,%f,%f) \n", a, x, y, z);
}