Name:

#include <stdio.h>
#include <stdlib.h>
void test1(int v){
    v = 20;
    printf("test 1: v = %d\n", v);
}

void test2(int * v1){    
    *v1 = 10;
    printf("test 2: v1 = %d\n", *v1);
}

void test3(int * v1){    
    v1 = (int*)malloc(sizeof(int));
    *v1 = 15;
    printf("test 3: v1 = %d\n", *v1);
}

int main(int argc, char** argv) {
    int v = 0;
    printf("main, 1, v = %d\n", v);
    test1(v);
    printf("main, 2, v = %d\n", v);
        
    int* v1;
    v1 = (int*)malloc(sizeof(int));
    *v1 = 5;
    printf("--------------------\n");
    printf("main, 3, v1 = %d\n", *v1);
    printf("main, 4, v1 = %d\n", v1);
    
    printf("--------------------\n");
    test2(v1); 
    printf("main, 5: v1 = %d\n", *v1);
    
    printf("--------------------\n");
    test3(v1); 
    printf("main, 6: v1 = %d\n", *v1);
    free(v1); 
    return 0;
}

Is there any difference between functions test1 and test2? Clearly justify your answer.
  
  
  
Which one of these would be a correct function call: test1(v1) or test1(*v1)? Justify your answer.