# Conditional OperatorTernary Operator

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Evaluates its first operand, and, if the resulting value is not equal to zero, evaluates its second operand. Otherwise, it evaluates its third operand, as shown in the following example:

`a = b ? c : d;`

is equivalent to:

```if (b)
a = c;
else
a = d;```

This pseudo-code represents it : `condition ? value_if_true : value_if_false`. Each value can be the result of an evaluated expression.

```int x = 5;
int y = 42;
printf("%i, %i\n", 1 ? x : y, 0 ? x : y); /* Outputs "5, 42" */```

The conditional operator can be nested. For example, the following code determines the bigger of three numbers:

```big= a > b ? (a > c ? a : c)
: (b > c ? b : c);```

The following example writes even integers to one file and odd integers to another file:

```#include<stdio.h>

int main()
{
FILE *even, *odds;
int n = 10;
size_t k = 0;

even = fopen("even.txt", "w");
odds = fopen("odds.txt", "w");

for(k = 1; k < n + 1; k++)
{
k%2==0 ? fprintf(even, "\t%5d\n", k)
: fprintf(odds, "\t%5d\n", k);
}
fclose(even);
fclose(odds);

return 0;
}```

The conditional operator associates from right to left. Consider the following:

`exp1 ? exp2 : exp3 ? exp4 : exp5`

As the association is from right to left, the above expression is evaluated as

`exp1 ? exp2 : ( exp3 ? exp4 : exp5 )`