View Compilation Error

0_0_3910471_20478.cpp:3: error: `x1' has not been declared
0_0_3910471_20478.cpp:5: error: ISO C++ forbids declaration of `parameter' with no type
0_0_3910471_20478.cpp: In function `float count(float, int, float, float, float)':
0_0_3910471_20478.cpp:7: error: `x1' undeclared (first use this function)
0_0_3910471_20478.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3910471_20478.cpp: At global scope:
0_0_3910471_20478.cpp:12: error: `main' must return `int'
0_0_3910471_20478.cpp: In function `int main(...)':
0_0_3910471_20478.cpp:22: error: `y1' undeclared (first use this function)