浙大版《C语言程序设计（第3版）》题目集 习题9-3 平面向量加法 (15分)

#include <stdio.h>
#include <math.h>
struct vector
{
    double x;
    double y;
};
int main()
{
    struct vector v1, v2, v3;
    scanf("%lf %lf", &v1.x, &v1.y);
    scanf("%lf %lf", &v2.x, &v2.y);
    v3.x = v1.x + v2.x;
    v3.y = v1.y + v2.y;
    if (fabs(v3.x) < 0.05)
        v3.x = fabs(v3.x);
    if (fabs(v3.y) < 0.05)
        v3.y = fabs(v3.y);
    printf("(%.1f, %.1f)", v3.x, v3.y);
    return 0;
}