What's wrong with my Do While Condition?

[mingke]

If for example I have four arrays (with different value), and I have another array which is the result of calculation between these four arrays. Then, I can sort the final array to ascending order and I want to search from the four arrays that can result the sorted final array...

I used do while loop but I guess something wrong with it because it keep resulting 0.

Here's my a part of code which has problem:

 
for (i=0; i<size2; i++){          
      for (k = 0; k < point3[i]; k++){       
           for (a=0;a<b[i][k];a++){          
                for (l=0;l<b[i][k];l++){
                     do{
                
               gradient [i][k][a]= fabs((S[i][k][j]-Cy[i][k])/(R[i][k][j]-Cx[i][k]))-teta[i][k][a]; 
//teta[i][k][a] =  fabs((S[i][k][a]-Cy[i][k])/(R[i][k][a]-Cx[i][k])),but in the statement above teta[i][k][a] has already sorted

                    X[i][k][a]=R[i][k][l];    
                    Y[i][k][a]=S[i][k][l]; 
                 }
               while (gradient[i][k][a]==0);  
               
               }
              printf ("[%d][%d][%d]=%f\n",i,k,a,X[i][k][a]);   
                
           }
      }
    }

Could you help me spot the error, please?

[weaknessforcats]

Have you tried stepping through this with your debugger?

[donbock]

I may not be looking closely enough, but it looks to me like the same value will be assigned to gradient[][][] each time through the loop. Nothing changes. I would expect you to either exit from the loop after a single pass or get stuck there in an infinite loop.