C

C Passing Pointers to Functions

#include <stdio.h>

void addOne(int* ptr) {
  (*ptr)++; // adding 1 to *ptr
}

int main()
{
  int* p, i = 10;
  p = &i;
  addOne(p);

  printf("%d", *p); // 11
  return 0;
}

c function pointer in argument

void f(void (*a)()) {
    a();
}

void test() {
    printf("hello world
");
}

int main() {
     f(&test);
     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;
}