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Task/Nth/AWK/nth.awk

@@ -0,0 +1,32 @@
+# syntax: GAWK -f NTH.AWK
+BEGIN {
+    prn(0,25)
+    prn(250,265)
+    prn(1000,1025)
+    exit(0)
+}
+function prn(start,stop,  i) {
+    printf("%d-%d: ",start,stop)
+    for (i=start; i<=stop; i++) {
+      printf("%d%s ",i,nth(i))
+    }
+    printf("\n")
+}
+function nth(yearday,  nthday) {
+    if (yearday ~ /1[1-3]$/) {         # 11th,12th,13th
+      nthday = "th"
+    }
+    else if (yearday ~ /1$/) {         # 1st,21st,31st,etc.
+      nthday = "st"
+    }
+    else if (yearday ~ /2$/) {         # 2nd,22nd,32nd,etc.
+      nthday = "nd"
+    }
+    else if (yearday ~ /3$/) {         # 3rd,23rd,33rd,etc.
+      nthday = "rd"
+    }
+    else if (yearday ~ /[0456789]$/) { # 4th-10th,20th,24th-30th,etc.
+      nthday = "th"
+    }
+    return(nthday)
+}