C++ Language
#include<iostream.h> #include<conio.h> void main() { int calsum(int,int,int); int n1,n2,n3,sum; clrscr(); cout<<"Enter three numbers - "; cin>>n1>>n2>>n3; sum=calsum(n1,n2,n3); cout<<"\nSum of three numbers - "<<sum; getch(); } int calsum(int a,int b,int c) { int s; s=a+b+c; return(s); } /*OUTPUT*/ Enter three numbers - 10 20 30 Sum of three numbers - 60