View Compilation Error

0_0_28298019_1670.cpp: In function 'int main()':
0_0_28298019_1670.cpp:60:48: error: 'abss' was not declared in this scope
      di[cnt++].power=abss(fie[i][j]-fie[i][j+1]);
                                                ^
0_0_28298019_1670.cpp:71:49: error: 'abss' was not declared in this scope
       di[cnt++].power=abss(fie[i][j]-fie[i+1][j]);
                                                 ^
0_0_28298019_1670.cpp:77:49: error: 'abss' was not declared in this scope
       di[cnt++].power=abss(fie[i][j]-fie[i][j+1]);
                                                 ^