PTA-平面向量加法（C语言）

#include <stdio.h> int main(){ double x1,x2,y1,y2,x,y; scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2); x=x1+x2;y=y1+y2; if(x>-0.05&&x<0){ x=0.0; } if(y>-0.05&&y<0){ y=0.0; } printf("(%1.1f, %1.1

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