Submission #3014672

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Source Code Expand

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<cmath>
#include<map>
#include<queue>
#include<stack>
#include<list>
#include<set>
#include<cstring>
#include<string>
using namespace std;
int main(){
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	double a1,a2,b1,b2,s,x1,x2,x3,y1,y2,y3;
    scanf("%lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3);
    a1=x2-x1;
    a2=y2-yy;
    b1=x2-x3;
    b2=y2-y3;
    s=(a1*b2-a2*b1)/2;
    if(s<0)
        s=-s;
    printf("%.1lf\n",s);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:19:11: error: ‘yy’ was not declared in this scope
     a2=y2-yy;
           ^
./Main.cpp:17:61: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3);
                                                             ^