0_0_34499894_4808.cpp: In function 'int main()':
0_0_34499894_4808.cpp:6:30: error: 'a' was not declared in this scope
while(~scanf("%f %f %f %f",&a,&b,&c,&d))
^
0_0_34499894_4808.cpp:6:33: error: 'b' was not declared in this scope
while(~scanf("%f %f %f %f",&a,&b,&c,&d))
^
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