#include <stdio.h>
#include <stdlib.h>

typedef void (*FUNCTION_INT_INPUT_1_RETURN_VOID)(int);
typedef void (*FUNCTION_INT_INPUT_2_RETURN_VOID)(int, int);

void sample_1(int input_a);
void sample_2(int input_y, int input_z);
FUNCTION_INT_INPUT_1_RETURN_VOID main_function (FUNCTION_INT_INPUT_2_RETURN_VOID temp_2);


// start main function
void main(void) {

    printf("trace 3\n\n");
    (main_function(&sample_2))(10);
    printf("trace 4\n\n");

}

void sample_1(int input_a) {

    int *temp_a;
    temp_a = (int *)malloc(sizeof(input_a)*1);
    *temp_a = input_a-5;
    printf("result sample_1 is %i\n\n",*temp_a);
    free(temp_a);

}

void sample_2(int input_y, int input_z) {

    int *temp_b;
    temp_b = (int *)malloc(sizeof(input_y)*2);
    *temp_b = input_y + input_z;
    printf("result sample_2 is %i\n\n",*temp_b);
    free(temp_b);

}

FUNCTION_INT_INPUT_1_RETURN_VOID main_function (FUNCTION_INT_INPUT_2_RETURN_VOID temp_2) {

    if (temp_2) {

        temp_2(3,4);
    }
    printf("trace 1\n\n");
    return &sample_1;

}