c++ - Segmentation Fault :11 -

i getting segmentation fault: 11

now,

char array[10000000] reserves 10000000 bytes or around 9.53 mb should not problem. doing wrong?

code:

#include <iostream>  #define version 0 #define array_size 10000000 #define hex_array  2500000  //variables char array[array_size]={}; char *frequency[16]={}; int t,n,freq;  //function declarations inline void flip(int start, int end); inline void store_output(); inline void init_array(); inline void show_output();  int main(int argc, char *argv[]){   int x,y;   //input   std::cin >> t; // number of test cases   for(freq =0 ; freq <t ; freq++){     std::cin >> n; // number of operations     for(int i=0 ; < n-1 ; i++){       flip(std::cin >>x,std::cin >>y); //check arg if prob     }     store_output();     init_array();   }   show_output();   return 0; }  inline void flip(int start, int end){ // done   (int i=start-1; i<end; i++){   // start-1 array starts 1 index not 0   // ->given condition     (array[i]==0?array[i] =1 : array[i] =0);   } }  inline void store_output(){ //done   for(int i=0; < hex_array;i+=4){     int hex= array[i] + 2*array[i+1] + 4*array[i+2]     + 8*array[i+3];     frequency[freq][hex]++;   } }      inline void init_array(){ // done for(int i=0;i < array_size;i++){     array[i] = 0;   }  *frequency = new char[16](); //// xxxx     }  inline void show_output(){ // done (int i=0; < t ; i++){   for(int j=0; j < 15 ; j++){     std::cout << frequency[i][j] << " ";     }     std::cout << frequency[i][15] << std::endl;   } } 

i ran above code g++ -o2 -g -v option. following output

apple llvm version 6.1.0 (clang-602.0.49) (based on llvm 3.6.0svn) target: x86_64-apple-darwin14.1.0 thread model: posix  "/library/developer/commandlinetools/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.10.0 -emit-obj -disable-free -disable-llvm-verifier -main-file-name test.cpp -mrelocation-model pic -pic-level 2 -mdisable-fp-elim -masm-verbose -munwind-tables -target-cpu core2 -target-linker-version 242 -v -dwarf-column-info -resource-dir /library/developer/commandlinetools/usr/bin/../lib/clang/6.1.0 -stdlib=libc++ -o2 -fdeprecated-macro -fdebug-compilation-dir /users/calpo/desktop -ferror-limit 19 -fmessage-length 204 -stack-protector 1 -mstackrealign -fblocks -fobjc-runtime=macosx-10.10.0 -fencode-extended-block-signature -fcxx-exceptions -fexceptions -fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops -vectorize-slp -o /var/folders/60/zg6r9xqx0r3113lp2j6w4kqm0000gn/t/test-aacf88.o -x c++ test.cpp clang -cc1 version 6.1.0 based upon llvm 3.6.0svn default target x86_64-apple-darwin14.1.0 ignoring nonexistent directory "/usr/include/c++/v1" #include "..." search starts here: #include <...> search starts here:  /library/developer/commandlinetools/usr/bin/../include/c++/v1  /usr/local/include  /library/developer/commandlinetools/usr/bin/../lib/clang/6.1.0/include  /library/developer/commandlinetools/usr/include  /usr/include  /system/library/frameworks (framework directory)  /library/frameworks (framework directory) end of search list.  "/library/developer/commandlinetools/usr/bin/ld" -demangle -dynamic -arch x86_64 -macosx_version_min 10.10.0 -o -g test /var/folders/60/zg6r9xqx0r3113lp2j6w4kqm0000gn/t/test-aacf88.o -lc++ -lsystem /library/developer/commandlinetools/usr/bin/../lib/clang/6.1.0/lib/darwin/libclang_rt.osx.a ld: can't link main executable file 'test' architecture x86_64 clang: error: unable execute command: segmentation fault: 11 clang: error: linker command failed due signal (use -v see invocation) 

in code, you're calling store_output() before init_array(). lead use of uninitialized memory.

you need call init_array() before can use frequency[a][b].