0_0_24099636_9621.cpp: In function 'int main(int, const char**)':
0_0_24099636_9621.cpp:12:27: error: 'strlen' was not declared in this scope
len = strlen(a);
^
0_0_24099636_9621.cpp:23:36: error: 'isupper' was not declared in this scope
if(isupper(a[i]))
^
0_0_24099636_9621.cpp:25:41: error: 'islower' was not declared in this scope
else if(islower(a[i]))
^
0_0_24099636_9621.cpp:27:41: error: 'isdigit' was not declared in this scope
else if(isdigit(a[i]))
^
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