A structured program to find average of 5 subject with C

A structured program to find average of 5 subject with C LANGUAGE:-
//CODE BY ALI RAZA
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#include<stdio.h>

#include<conio.h>

int main()

float  avg(int);

{

    int x,y=0,z=0;

 

    for(x=1;x<5;x++)

    {

        printf("enter num of sub%d:",x);

        scanf("%d",&y);

        z=z+y;

        }

    printf("toal=%d",z);

    avg(z);

    getch();

    }

float avg(int m)

{

     int z;

float y;    

printf("enter total num:");   

  scanf("%d",&z);  

   y=m*100/z; 

    printf("%f",y);   

  return y;  

}