Something

#include <stdio.h>

int main(void) {

int primefunction()

int max; {
printf("Insert the maximum number");
scanf("%d", &max); 
}

int n;

for(n = 0; n <= max; n++); { 
if(n / n == 1 && n / 1 == n);
printf("The prime numbers are: %d", n);        
}

return 0;
}