abs

函数原型

long abs(long x);

功能

求x的绝对值

说明

计算|x|，当x为负数时返回-x，否则返回x

示例

void main()
{
    int x;

    SetScreen(0);
    x = -5;
    printf("|%d|=%d\n", x, abs(x));
    x = 0;
    printf("|%d|=%d\n", x, abs(x));
    x = +5;
    printf("|%d|=%d\n", x, abs(x));
    getchar();
}