looping problems in c++

Question

Good efternoon ,

I'm working on a matrix of number (2D array) and I want to know how to automatically obtain the sum of the elements of each line and their average. the file construct is as follows:

14 25 65 41 24 85 69
14 52 87 56 42 35 47
25 64 89 21 56 7  45
15 42 8  7  65 47 7

I used the following prtion of code:

for(i=0; i<7; i++){
   for (j=0; j<4; j++){ 
    double sum(0);
    sum+=M[i][j];
    average=sum/7;}}

but I don't get what I asked for. Any correction, please?!

Answer 1

You have 4 arrays of 7 elements. So for each array, set sum to zero. for each element in the array, add it to sum. then calculate the average.

for(i=0; i<4; i++){
   double sum(0);
   for (j=0; j<7; j++){ 
    sum+=M[i][j];
   }
   average=sum/7;
}