Step 1:
int i=-3, j=2, k=0, m; here variable
i, j, k, m are declared as an integer type and variable
i, j, k are initialized to -3, 2, 0 respectively.
Step 2: m = ++i && ++j && ++k;
becomes m = -2 && 3 && 1;
becomes m = TRUE && TRUE; Hence this statement becomes TRUE. So it returns '1'(one). Hence m=1.
Step 3: printf("%d, %d, %d, %d\n", i, j, k, m); In the previous step the value of i,j,k are increemented by '1'(one).
Hence the output is "-2, 3, 1, 1".