for(j=0; j<sizes[i]; j++){ 
   diff = ptr[set[i][j][2]*in_width+set[i][j] [3]] - 
          ptr[set[i][j][0]*in_width+set[i][j] [1]]; 
   count += (diff>THRESH || diff<-THRESH);
} 

Example 2: Inner loop body in C.