What are actual parameters(arguments) and formal parameters?

Parameters in calling function are called actual parameters or Arguments

Parameters in Called functions are called formal parameters

#include<stdio.h>

int sum(int,int);

void main()

{

  int a,b,result;

  printf("Enter 2 values:");

  scanf("%d%d",&a,&b);

  result=sum(a,b); //Parameters given here are actual parameters(Arguments)

  printf("Sum of %d and %d is %d",a,b,result);

}

int sum(int a,int b) //Parameters given here are formal parameters

{

  int c;

  c=a+b;

  return(c);

}