subroutine sum(a, s1, s2) real a(4, 4) s1=0 do10i=1,4 s1=s1+a(i,) 10 continue s2=0 do20i=1,4 s2=s2+a(5-) 20 continue end §2子例程子程序 2021/2/2417 2021/2/24 §2 子例程子程序 subroutine sum(a, s1, s2) real a(4,4) s1=0 do 10 i=1,4 s1=s1+a(i,i) 10 continue s2=0 do 20 i=1,4 s2=s2+a(i,5-i) 20 continue end