Error when comparing float and element array of float - c

Question

So I have a to create a program that creates an array and adds 6 grades to it, then it has to calculate the average in a different function, and then check what grades are above the average.
It all worked until this little operation started to throw an error like such:
main.c:29:18: error: invalid operands to binary < (have 'float (*)(float *)' and 'float')
#include <stdio.h>
#include <stdlib.h>
float media(float grades[]){
int sum = 0;
for(int i = 0; i < 5; i++){
sum += grades[i];
}
float media = sum/6;
printf("A media é %f", media);
return media;
}
int acimamedia(float media(float grades[]), float vetor[], int x){
for(int i = 0; i < 6;i++){
float z = vetor[i];
if(media < z){ // <<<<<<<<<<<<< [Error here]
x += 1;
}
}
return x;
}
int main(int argc, char** argv) {
float grades[6];
int acimadamedia;
printf("As notas sao: \n");
for(int i = 0; i < 6; i++){
grades[i] = rand()%100;
printf("Nota [%d] -- %f",i , grades[i]);
}
printf("Existem %d notas acima da media.", acimadamedia());

Answer 1

media is a function declaration:
float media(float grades[])
and z is a single float value
so you are trying to compare a function pointer to a float hence the error is exactly as what it says:
error: invalid operands to binary < (have 'float (*)(float *)' and 'float')
In addition your call of acimadamedia() is trying to treat an integer as a function.
If I kind of understand what you are trying to do and do the minimum of changes to your code:
#include <stdio.h>
#include <stdlib.h>
float media(float grades[]){
int sum = 0;
for(int i = 0; i < 5; i++){
sum += grades[i];
}
float media = sum/6;
printf("A media é %f\n", media);
return media;
}
int acimamedia(float media(float grades[]), float vetor[]){
int x = 0;
float avg = media(vetor);
for(int i = 0; i < 6;i++){
float z = vetor[i];
if(avg < z){
x += 1;
}
}
return x;
}
int main(int argc, char** argv) {
float grades[6];
int acimadamedia;
printf("As notas sao: \n");
for(int i = 0; i < 6; i++){
grades[i] = rand()%100;
printf("Nota [%d] -- %f\n",i , grades[i]);
}
acimadamedia = acimamedia(&media, grades);
printf("Existem %d notas acima da media.\n", acimadamedia);
return 0;
}
Will show the grades, the avg grade and the number of grades above the average
the acimamedia function for passing a function usally is specified as:
int acimamedia(float (*media)(float grades[]), float vetor[])