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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