C

pass the pointer to the function

#include<stdio.h>

//pass the simple pointer to the function

void swapnum(int* i, int* j)
{
  	int tmp = *i;
  	*i = *j;
  	*j = temp;
}

int main()
{
  	int a = 10;
  	int b = 20;
  	swap(&a,&b);
  	printf("A is %d and B is %d
", a , b);
  	return 0;
}

Passing pointer to function

#include <stdio.h>
   
void getDoubleValue(int *F){
   *F = *F + 2;
   printf("F(Formal Parameter) = %d
", *F);
}
  
int main(){
   int A;
   printf("Enter a numbers
");
   scanf("%d", &A);
   /* Calling function using call by reference */
   getDoubleValue(&A);
   /* Any change in the value of formal parameter(F)
   will effect the value of actual parameter(A) */
   printf("A(Actual Parameter) = %d
", A);
     
   return 0;
}