Data commit

Task/String-comparison/C/string-comparison-1.c

@@ -0,0 +1,2 @@
+/* WRONG! */
+if (strcmp(a,b)) action_on_equality();

Task/String-comparison/C/string-comparison-2.c

@@ -0,0 +1,61 @@
+/*
+  compilation and test in bash
+  $ a=./c && make $a && $a ball bell ball ball YUP YEP     ball BELL ball BALL YUP yep
+  cc -Wall -c -o c.o c.c
+  	eq , ne , gt , lt , ge , le
+  ball 0 1 0 1 0 1 bell
+  ball 0 1 0 1 0 1 bell ignoring case
+  ball 1 0 0 0 1 1 ball
+  ball 1 0 0 0 1 1 ball ignoring case
+  YUP 0 1 1 0 1 0 YEP
+  YUP 0 1 1 0 1 0 YEP ignoring case
+  ball 0 1 1 0 1 0 BELL
+  ball 0 1 0 1 0 1 BELL ignoring case
+  ball 0 1 1 0 1 0 BALL
+  ball 1 0 0 0 1 1 BALL ignoring case
+  YUP 0 1 0 1 0 1 yep
+  YUP 0 1 1 0 1 0 yep ignoring case
+*/
+
+#include<string.h>
+
+#define STREQ(A,B) (0==strcmp((A),(B)))
+#define STRNE(A,B) (!STREQ(A,B))
+#define STRLT(A,B) (strcmp((A),(B))<0)
+#define STRLE(A,B) (strcmp((A),(B))<=0)
+#define STRGT(A,B) STRLT(B,A)
+#define STRGE(A,B) STRLE(B,A)
+
+#define STRCEQ(A,B) (0==strcasecmp((A),(B)))
+#define STRCNE(A,B) (!STRCEQ(A,B))
+#define STRCLT(A,B) (strcasecmp((A),(B))<0)
+#define STRCLE(A,B) (strcasecmp((A),(B))<=0)
+#define STRCGT(A,B) STRCLT(B,A)
+#define STRCGE(A,B) STRCLE(B,A)
+
+#include<stdio.h>
+
+void compare(const char*a, const char*b) {
+  printf("%s%2d%2d%2d%2d%2d%2d %s\n",
+	 a,
+	 STREQ(a,b), STRNE(a,b), STRGT(a,b), STRLT(a,b), STRGE(a,b), STRLE(a,b),
+	 b
+	 );
+}
+void comparecase(const char*a, const char*b) {
+  printf("%s%2d%2d%2d%2d%2d%2d %s ignoring case\n",
+	 a,
+	 STRCEQ(a,b), STRCNE(a,b), STRCGT(a,b), STRCLT(a,b), STRCGE(a,b), STRCLE(a,b),
+	 b
+	 );
+}
+int main(int ac, char*av[]) {
+  char*a,*b;
+  puts("\teq , ne , gt , lt , ge , le");
+  while (0 < (ac -= 2)) {
+    a = *++av, b = *++av;
+    compare(a, b);
+    comparecase(a, b);
+  }
+  return 0;
+}