0_0_29432421_16165\Main.java:1: 错误: 需要class, interface或enum
int main()
^
0_0_29432421_16165\Main.java:1: 错误: 需要class, interface或enum
int main()
^
0_0_29432421_16165\Main.java:4: 错误: 需要class, interface或enum
double t;
^
0_0_29432421_16165\Main.java:5: 错误: 需要class, interface或enum
while(scanf("%d",&a)&&a)
^
0_0_29432421_16165\Main.java:8: 错误: 需要class, interface或enum
for(i=0;i<a;i++)
^
0_0_29432421_16165\Main.java:8: 错误: 需要class, interface或enum
for(i=0;i<a;i++)
^
0_0_29432421_16165\Main.java:8: 错误: 需要class, interface或enum
for(i=0;i<a;i++)
^
0_0_29432421_16165\Main.java:11: 错误: 需要class, interface或enum
scanf("%d",&y[i]);
^
0_0_29432421_16165\Main.java:12: 错误: 需要class, interface或enum
}
^
0_0_29432421_16165\Main.java:14: 错误: 需要class, interface或enum
y1=y[0];
^
0_0_29432421_16165\Main.java:15: 错误: 需要class, interface或enum
for(i=1;i<a-1;i++)
^
0_0_29432421_16165\Main.java:15: 错误: 需要class, interface或enum
for(i=1;i<a-1;i++)
^
0_0_29432421_16165\Main.java:15: 错误: 需要class, interface或enum
for(i=1;i<a-1;i++)
^
0_0_29432421_16165\Main.java:18: 错误: 需要class, interface或enum
y2=y[i];
^
0_0_29432421_16165\Main.java:19: 错误: 需要class, interface或enum
x3=x[i+1];
^
0_0_29432421_16165\Main.java:20: 错误: 需要class, interface或enum
y3=y[i+1];
^
0_0_29432421_16165\Main.java:21: 错误: 需要class, interface或enum
t+=(double)(x2*y3+x1*y2+x3*y1-x3*y2-x2*y1-x1*y3)/2.0;
^
0_0_29432421_16165\Main.java:22: 错误: 需要class, interface或enum
}
^
0_0_29432421_16165\Main.java:24: 错误: 需要class, interface或enum
}
^
0_0_29432421_16165\Main.java:26: 错误: 需要class, interface或enum
}
^
20 个错误
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