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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:

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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 )

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