c++ - function has effects on the other functions that run before it did -

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{     int x = hfilter * threebythree(i,j,getdata(),getnumrows(),getnumcols());     int y = vfilter * threebythree(i,j,getdata(),getnumrows(),getnumcols());     int value = floor(sqrt(x*x+y*y));      //evil setvalue function     setvalue(i,j,value); }  image image::threebythree(int globali,int globalj, int** matrix,int row,int col) {     image neighbor;     neighbor.setnumrows(3);     neighbor.setnumcols(3);     neighbor.allocatemem();      for(int i=0; i<3; ++i)     {         for(int j=0; j<3; ++j)         {              if((i+globali-1 >=0) && (j+globalj-1 >=0) && (i+globali-1 < row) && (j+globalj-1 < col))             {                 //cout<< matrix[i+globali-1][j+globalj-1] << " , ";                 neighbor.setvalue(i,j,matrix[i+globali-1][j+globalj-1]);             }             else             {                 neighbor.setvalue(i,j,0);             }         }     }       for(int i=0; i<3; ++i)     {         for(int j=0; j<3; ++j)         {             cout << neighbor.getvalue(i,j)<< ",";         }         cout << endl;     }      return neighbor; }    void matrix::setvalue(int i, int j, int value) {     data[i][j] = value; }

what i'm doing here threebythree() generates 3x3 matrix when traversing through big matrix 100x100.

everything works fine if comment out the: 

setvalue(i,j,value);

threebythree() prints out nice 3x3 matrix like: 

47,50,0, 50,55,0, 0,0,0,

but with setvalue(i,j,value), runs after threebythree(), 3x3 matrix changed to:

35384,-2147483648,0, 42428,55,0, 0,0,0,

how function have impact on functions executed before did?


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