Course Content
Programming Language C
About Lesson
Function –
 It is set of instructions under a name.
 It is part of program.
 It is known as sub program.
 
#include<stdio.h>
#include<conio.h>

msg()   // definition
{
   printf("\nHello User");
   printf("\nWelcome in C");
   //printf("\nI am doing C");
}

int main()
{
   clrscr();

   msg(); // calling

   printf("\nC Develop by Dennis Retchie");

   msg();

   printf("\nC Develop in 1972");

   msg();

   sum(); //call

   getch();
}

sum()
{
  int n1,n2,r;
  printf("\nenter 2 nos");
  scanf("%d%d",&n1,&n2);
  r=n1+n2;
  printf("\nSum=%d",r);

}
/*
output:

Hello User
Welcome in C

C Develop by Dennis Retchie

Hello User
Welcome in C

C Developed in 1972

Hello User
Welcome in C

I am learning C at SIRCL TECH

Hello User
Welcome in C

*/