0_0_6666888_7636.cpp: In function `void add(int, int)':
0_0_6666888_7636.cpp:15: error: `ch' undeclared (first use this function)
0_0_6666888_7636.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6666888_7636.cpp: In function `int main()':
0_0_6666888_7636.cpp:60: error: `ch' undeclared (first use this function)
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