0_0_1985453_30292.cpp: In function `int main()':
0_0_1985453_30292.cpp:11: error: `sum' undeclared (first use this function)
0_0_1985453_30292.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1985453_30292.cpp:11: error: `sub' undeclared (first use this function)
0_0_1985453_30292.cpp:29: error: `gpa' undeclared (first use this function)
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