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View Compilation Error

0_0_35107068_20007.cpp: In constructor 'BigNum::BigNum()':
0_0_35107068_20007.cpp:13:40: error: 'memset' was not declared in this scope
   BigNum(){len = 1;memset(a,0,sizeof(a));} 
                                        ^
0_0_35107068_20007.cpp: In constructor 'BigNum::BigNum(int)':
0_0_35107068_20007.cpp:32:23: error: 'memset' was not declared in this scope
   memset(a,0,sizeof(a)); 
                       ^
0_0_35107068_20007.cpp: In constructor 'BigNum::BigNum(const char*)':
0_0_35107068_20007.cpp:42:23: error: 'memset' was not declared in this scope
   memset(a,0,sizeof(a));
                       ^
0_0_35107068_20007.cpp:43:13: error: 'strlen' was not declared in this scope
   l=strlen(s);   
             ^
0_0_35107068_20007.cpp: In copy constructor 'BigNum::BigNum(const BigNum&)':
0_0_35107068_20007.cpp:58:23: error: 'memset' was not declared in this scope
   memset(a,0,sizeof(a)); 
                       ^
0_0_35107068_20007.cpp: In member function 'BigNum& BigNum::operator=(const BigNum&)':
0_0_35107068_20007.cpp:64:23: error: 'memset' was not declared in this scope
   memset(a,0,sizeof(a)); 
                       ^
0_0_35107068_20007.cpp: In member function 'BigNum BigNum::operator^(const int&) const':
0_0_35107068_20007.cpp:177:8: error: 'i' was not declared in this scope
     m-=i;
        ^


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