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View Compilation Error

0_0_37817711_25540.cpp: In function 'int main()':
0_0_37817711_25540.cpp:4:15: error: 'a' was not declared in this scope
 scanf("%f %f",a,b)
               ^
0_0_37817711_25540.cpp:4:17: error: 'b' was not declared in this scope
 scanf("%f %f",a,b)
                 ^


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