C语言中的逗号操作符

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#include <stdio.h>

int foo1()
{
printf("1\n");
return 1;
}
int foo2()
{
printf("2\n");
return 2;
}
int foo3()
{
printf("3\n");
return 3;
}
int main(void)
{

int n = (foo1(),foo2(),foo3());

printf("n:%d\n",n);

return 0;
}

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运行结果：

1

2

3

n:3