Control Structures

ELI supports control structures with seven researved words

if , else , case , for , while , break , continue

for

@.test_for n
for(i:1;n){
  []<-i
}
@.

      test_for 5
1
2
3
4
5

if-else

@.p<-rprime n;i
p<-2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
if (n<=100) p<-(n>=p)/p
else {pl<-#p<-rprime _.n*.0.5
  b<-n#0
  for (i:1;pl) b<-b&n#(-p[i])^.1
  p<-p,1!.(~b)/!n
}
@.

      rprime 300
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151
157 163 167 173 179 181 191 193 197 199 211 223 227 229 233 239 241 251 257 263 269 271 277 281 283 293

while

@.L<-TSORT G;N;ML
L<-!0
S<-(0=+/.G)/GL<-!1^.#G
while (0<#S) {
L<-L,N<-S[1]
S<-1!.S
ML<-G[N;]/GL
G[N;ML]<- 0
S<-S,(0=+/.G[;ML])/ML
}
if (0<+/+/G) []<-'Graph G is not acyclic.'
@.

      G
0 1 0 1 0 1 0 0
0 0 0 0 0 0 0 0
0 0 0 1 0 0 0 1
0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 1
0 0 0 0 0 1 0 0

      TSORT G
3 5 7 1 8 2 4 6

case

@.z<-tst_cas x
case (:x) {
 0,1:z<-x+10
 2:z<-x*10
 3:z<-x
 5:case (x) {
 `select:z<-'SELECT'
 `exec:z<-'EXEC'
 else z<-'***'
 }
 else z<-x+100
}
@.
// execute
      tst_cas 9
19
      tst_cas 1.2
12
      tst_cas 'ABC'
ABC
      tst_cas `ABC
***
      tst_cas 20:55
22:35