Thread: ternary operation with compound instruction

I suppose you could use the comma operator, but you have to know that it only returns the value of the rightmost expression.

Code:

x > 10 ? printf( "x > 10" ), printf( "\n" ) : printf( "x <= 10" ), printf( "\n" );

Well, may-be you'll need an extra set of parenthesis?

Code:

#include <stdio.h>
int main()
{
    int a = 5;
    int b = a > 4 ? (printf("More than 4\n"), 1) : (printf("Not more than 4\n"), 2);
    printf("&#37;d", b);
    return 0;
}

Anyway, it might be actually clearer as a if...else expression.

A passing thought on the matter:

Code:

#include <stdio.h>

void foo(int x, int y)
{
   printf("&#37;d %s %d\n", x, x < y ? "<" : ">=", y);
}

int main ()
{
   foo(5, 10);
   foo(15, 10);
    return 0;
}

/* my output
5 < 10
15 >= 10
*/

Braces are for code blocks with their own scope. I don't believe any operator (including ? allows it's operands to be blocks of code.

But there is such a comma operator and it must have some use.