Program to combine two strings by using pointers

void main(void){

  char sta[]="Hello";

  char stb[]="World";

  char stc[20];

  char *s=stc;

  char *ptr=sta;

  while(*ptr!='\0'){

  *s=*ptr; *s++; *ptr++;

  }

  *s=' '; *s++; ptr=stb;

  while(*ptr!='\0'){

  *s=*ptr; *s++; *ptr++;

  }

  *s='\0';

  cout<<stc<<endl;

}

Swap two values by using pointers as arguments to a function

void swap(int *, int *);
void main(void) {
int a,b;
a=10;
b=20;
swap(&a,&b);
cout<<"a="<<a<<endl;
cout<<"b="<<b<<endl;
}
void swap(int *x, int *y) {
int temp;
temp=*x;
*x=*y;
*y=temp;
}

Program to input data into an array and then to print on the screen by using pointers as function arguments

output

void display(int *);

void main(void) {

  int i,arr[5];

  cout<<"\nInput:\n";

  for(i=0;i<5;i++) {

  cin>>arr[i];

  }

  display(arr);

}

void display(int *ptr) {

  cout<<"\nOutput:\n";

  for(int i=0;i<5;i++) {

  cout<<*ptr<<endl;

  ptr++;

  }

}