What is void in C? tccicomputercoaching.com

The meaning for the word “void” is “nothing or completely empty”. This term plays a vital role in computerprogramming. The most familiar uses are:

1. Void as a Function Return Type
2. Void as a Function Parameter
3. Void as a Pointer Declaration

Examples:

1. Void as a Function Return Type

void maxval (int a,int b);
void main()
{ int x=6,y=10;
clrscr();
maxval(x,y);
getch();
}
void maxval(int a,int b)
{ if(a>b)
{
printf("\na=%d is greater value",a);
}
else
{
printf("\nb=%d is greater value",b);
}
}

2. Void as a Function Parameter

int sum(void); //function declare//
void main()
{ int ans;
clrscr();
 ans= sum();
 printf("%d",ans);
// printf("ans is %d", sum()); //function call//
getch();
}
int sum(void)//function defintion//
{
int a,b,c;
printf("enter the value of a,b");
scanf("%d%d",&a,&b);
c=a+b;
return c;
// printf("\n your addition is=%d",c);
}

3. Void as a Pointer Declaration
4. int main()
5. {
6. int a = 10;
7. void *ptr = &a;
8. printf("%d", *(int *)ptr);
9. return 0; 
10. }
11. OUTPUT:
12. 10

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