C中的运算符优先级和关联性

// Associativity is not used in the below program.
// Output is compiler dependent.

#include <stdio.h>

int x = 0;
int f1()
{
x = 5;
return x;
}
int f2() 
{
x = 10;
return x;
}
int main()
{
int p = f1() + f2();
printf("%d ", x);
return 0;
}

#include <stdio.h>
int main()
{
int a;
a = 1, 2, 3; // Evaluated as (a = 1), 2, 3
printf("%d", a);
return 0;
}

#include <stdio.h>
int main()
{
int a = 10, b = 20, c = 30;

// (c > b > a) is treated as ((c > b) > a), associativity of '>'
// is left to right. Therefore the value becomes ((30 > 20) > 10)
// which becomes (1 > 10)
if (c > b > a)
printf("TRUE");
else
printf("FALSE");
return 0;
}