C program call by value and call by reference mechanism

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

void value(int, int);
void reference(int *, int *);

int main(){
    int a, b;
    printf("Enter the value of a & b:-\n");
    scanf("%d%d", &a, &b);
    printf("Values before swapping:-\na: %d\nb: %d\n", a, b);
    value(a, b);
    printf("Values after call by value:-\na: %d\nb: %d\n", a, b);
    reference(&a, &b);
    printf("Values after call by reference:-\na: %d\nb: %d", a, b);
    return (0);
}

void value(int a, int b){
    int temp=a;
    a=b;
    b=temp;
    printf("Values inside call by value:-\na: %d\nb: %d\n", a, b);
}

void reference(int *a, int *b){
    int temp=*a;
    *a=*b;
    *b=temp;
    printf("Values inside call by reference:-\na: %d\nb: %d\n", *a, *b);
}