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#include#include int main(void){ float x1,x2,y1,y2,x,k,b; bool err=0; printf("请输入x1,y1,x2,y2，顺序输入，空格分开"); scanf("%f%f%f%f",&x1,&y1,&x2,&y2); k=(x1==x2)?(err=1):((y1-y2)/(x1-x2)); b=y1-k*x1; printf("请输入x:"); scanf("%f",&x); if(err && y1 != y2) printf("y不存在"); else printf("y=... |
