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A3Q1

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Compilation time: 0.12 sec, absolute running time: 0.18 sec, cpu time: 0.02 sec, memory peak: 3 Mb, absolute service time: 0,55 sec 
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Warning(s):
1685902325/source.c:9:5: warning: implicit declaration of function 'CallFun' is invalid in C99 [-Wimplicit-function-declaration]
    CallFun(&a);
    ^
1685902325/source.c:17:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
2 warnings generated.
This is the value of a before CallFun: 3
This is the value of a after CallFun: 7