In this type of function argument and parameter must be specified and function doesn't return any value so the datatype of function must be "void" syntax:- void function name(datatype arg 1,datatype arg 2) { statement; ......... .......... } example:-write a program to input 3 number and calculate sum using function with argument and no return. Ex:- void main() { int a,b,c; void sum(int,int,int); printf("\n enter three number"); scanf("%d%d%d",&a,&b,&c); sum(a,b,c); getch(); } void sum(int x,int y,int z) { int add; add=x+y+z; printf("\n sum of three number=%d",add); }