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//program to create a function that takes three integer arguments and calculates their sum #include<iostream.h> #include<conio.h> void sum(int,int,int); void sum(int a,int b,int c) { int sum; sum=a+b+c; cout<<"sum of three numbers is "<<sum; } void main() { int a,b,c; clrscr(); cout<<"enter value for a"; cin>>a; cout<<"enter value for b"; cin>>b; cout<<"enter value for c"; cin>>c; sum(a,b,c); getch(); }