View Code of Problem 67

#include <stdio.h>
int main(){
  float x1,y1,x2,y2,x3,y3,x4,y4,k1,k2;
  while (scanf("%d%d%d%d%d%d%d%d",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4) != EOF){
	  if(x1==x2&&x2==x3&&x3==x4)
		  printf("Yes");
     else if((x1==x2)&&(x3==x4))
      printf("No\n");
    else if((x1==x2) ||(x3==x4))
      printf("Yes\n");
      else{
        k1=(y2-y1)/((x2-x1)*1.0);
    	k2=(y4-y3)/(x4-x3)*1.0);
		if(k1 == k2){
			
			  if(y1-x1*k1==y3-x3*k2)								
					printf("Yes\n");
				else
					 printf("No\n");
 
		}
      	 
  
	  }
	  }
return 0;
}
/*
Main.c: In function 'main':
Main.c:4:3: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'float *' [-Wformat=]
   while (scanf("%d%d%d%d%d%d%d%d",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4) != EOF){
   ^
Main.c:4:3: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'float *' [-Wformat=]
Main.c:4:3: warning: format '%d' expects argument of type 'int *', but argument 4 has type 'float *' [-Wformat=]
Main.c:4:3: warning: format '%d' expects argument of type 'int *', but argument 5 has type 'float *' [-Wformat=]
Main.c:4:3: warning: format '%d' expects argument of type 'int *', but argument 6 has type 'float *' [-Wformat=]
Main.c:4:3: warning: format '%d' expects argument of type 'int *', but argument 7 has type 'float *' [-Wformat=]
Main.c:4:3: warning: format '%d' expects argument of type 'int *', but argument 8 has type 'float *' [-Wformat=]
Main.c:4:3: warning: format '%d' expects argument of type 'int *', but argument 9 has type 'float *' [-Wformat=]
Main.c:13:28: error: expected ';' before ')' token
      k2=(y4-y3)/(x4-x3)*1.0);
                            ^
Main.c:13:28: error: expected statement before ')' token
*/